diff --git a/app/client/mobile/src/content/Content.tsx b/app/client/mobile/src/content/Content.tsx
index aff716fa..f49f8352 100644
--- a/app/client/mobile/src/content/Content.tsx
+++ b/app/client/mobile/src/content/Content.tsx
@@ -26,11 +26,12 @@ export function Content({select}: {select: (focus: Focus) => void}) {
       action: () => setAlert(false),
     },
   });
+  const cards = (state.sealSet && sealed) ? state.sealable : state.connected;
 
   const addTopic = async () => {
     setAdding(true);
     try {
-      await actions.addTopic(sealed, subject, members);
+      await actions.addTopic(sealed, subject, members.filter(id => Boolean(cards.find(card => card.cardId === id))));
       setAdd(false);
       setSubject('');
       setMembers([]);
@@ -43,8 +44,6 @@ export function Content({select}: {select: (focus: Focus) => void}) {
     setAdding(false);
   };
 
-  const cards = sealed ? state.sealable : state.connected;
-
   return (
     <View style={styles.container}>
       <SafeAreaView style={styles.header}>
diff --git a/app/client/mobile/src/content/useContent.hook.ts b/app/client/mobile/src/content/useContent.hook.ts
index 5d992d96..f5a2b633 100644
--- a/app/client/mobile/src/content/useContent.hook.ts
+++ b/app/client/mobile/src/content/useContent.hook.ts
@@ -25,12 +25,12 @@ export function useContent() {
     layout: null,
     guid: '',
     connected: [] as Card[],
-    connectedAndSealable: [] as Cards[],
+    sealable: [] as Cards[],
     sorted: [] as Channel[],
     filtered: [] as ChannelParams[],
     filter: '',
     topic: '',
-    sealable: false,
+    sealSet: false,
   });
 
   const compare = (a: Card, b: Card) => {
diff --git a/app/client/web/src/content/Content.module.css b/app/client/web/src/content/Content.module.css
index de1985be..e5c11f0b 100644
--- a/app/client/web/src/content/Content.module.css
+++ b/app/client/web/src/content/Content.module.css
@@ -82,9 +82,52 @@
   flex-direction: column;
   gap: 16px;
 
+  .members {
+    padding-left: 4px;
+    font-size: 12px;
+    color: var(--mantine-color-text-6);
+  }
+
   .addMembers {
     width: 100%;
-    height: 200px;
+    min-height: 128px;
+    max-height: 256px;
     background: var(--mantine-color-surface-0);
+    overflow: scroll;
+    border: 1px solid var(--mantine-color-text-8);
+    border-radius: 2px;
+
+    .noContacts {
+      display: flex;
+      width: 100%;
+      height: 128px;
+      align-items: center;
+      justify-content: center;
+    
+      .noContactsLabel {
+        color: var(--mantine-color-text-6);
+      }
+    }
+
+    .card {
+      width: 100%;
+      height: 48px;
+      padding-top: 8px;
+      padding-bottom: 8px;
+      padding-right: 16px;
+      padding-left: 16px;
+      border-bottom: 1px solid var(--mantine-color-text-8);
+    }
+  }
+
+  .addControls {
+    display: flex;
+    flex-direction: row;
+    align-items: center;
+    gap: 16px;
+
+    .addSealed {
+      flex-grow: 1;
+    }
   }
 }
diff --git a/app/client/web/src/content/Content.tsx b/app/client/web/src/content/Content.tsx
index def44adb..4027d8ef 100644
--- a/app/client/web/src/content/Content.tsx
+++ b/app/client/web/src/content/Content.tsx
@@ -1,18 +1,65 @@
 import React, {useState} from 'react';
 import { useContent } from './useContent.hook'
-import { Modal, TextInput, Button } from '@mantine/core'
+import { Modal, Text, Switch, TextInput, Button } from '@mantine/core'
 import { IconSearch, IconMessagePlus, IconLabel } from '@tabler/icons-react'
 import classes from './Content.module.css'
 import { Channel } from '../channel/Channel'
 import { Focus } from 'databag-client-sdk'
+import { Card } from '../card/Card';
+import { modals } from '@mantine/modals'
 
 export function Content({ select }: { select: (focus: Focus) => void }) {
   const { state, actions } = useContent()
   const [add, setAdd] = useState(false);
+  const [adding, setAdding] = useState(false);
+  const [sealed, setSealed] = useState(false);
+  const [subject, setSubject] = useState('');
+  const [added, setAdded] = useState([]);
+  const cards = (state.sealSet && sealed) ? state.sealable : state.connected;
 
   const addTopic = async () => {
+    setAdding(true);
+    try {
+      await actions.addTopic(sealed, subject, added.filter(id => Boolean(cards.find(card => card.cardId === id))))
+      setAdd(false);
+      setSealed(false);
+      setAdded([]);
+      setSubject('');
+    }
+    catch (err) {
+      console.log(err);
+      showError();
+    }
+    setAdding(false);
   }
 
+  const showError = () => {
+    modals.openConfirmModal({
+      title: state.strings.operationFailed,
+      withCloseButton: true,
+      overlayProps: {
+        backgroundOpacity: 0.55,
+        blur: 3,
+      },
+      children: <Text>{state.strings.tryAgain}</Text>,
+      cancelProps: { display: 'none' },
+      confirmProps: { display: 'none' },
+    })
+  }
+
+  const contacts = cards.map((card, idx) => {
+    const enable = (<Switch key="add" className={classes.addMember} size="sm" checked={Boolean(added.find(id => id === card.cardId))} onChange={(ev) => {
+      if (ev.currentTarget.checked) {
+        setAdded([ ...added, card.cardId ]);
+      } else {
+        setAdded(added.filter(id => id !== card.cardId))
+      }
+    }} />)
+    return (
+      <Card key={idx} className={classes.card} imageUrl={card.imageUrl} name={card.name} handle={card.handle} node={card.node} placeholder={state.strings.name} actions={[enable]} />
+    )
+  });
+
   const channels = state.filtered.map((channel, idx) => {
     return (
       <Channel
@@ -59,7 +106,7 @@ export function Content({ select }: { select: (focus: Focus) => void }) {
           </Button>
         </div>
       )}
-      <Modal title={state.strings.newTopic} opened={add} onClose={() => setAdd(false)} overlayProps={{ backgroundOpacity: 0.55, blur: 3 }} centered>
+      <Modal title={state.strings.newTopic} opened={add} onClose={() => setAdd(false)} overlayProps={{ backgroundOpacity: 0.65, blur: 3 }} centered>
         <div className={classes.addContainer}>
           <TextInput
             className={classes.input}
@@ -67,11 +114,32 @@ export function Content({ select }: { select: (focus: Focus) => void }) {
             leftSectionPointerEvents="none"
             leftSection={<IconLabel size={20} />}
             placeholder={state.strings.subjectOptional}
-            value={state.filter}
-            onChange={(event) => actions.setFilter(event.currentTarget.value)}
+            value={subject}
+            onChange={(event) => setSubject(event.currentTarget.value)}
           />
-          <div className={classes.addMembers}>
-
+          <div>
+            <Text className={classes.members}>{ state.strings.members }</Text>
+            <div className={classes.addMembers}>
+              { cards.length === 0 && (
+                <div className={classes.noContacts}>
+                  <Text className={classes.noContactsLabel}>{ state.strings.noContacts }</Text>
+                </div>
+              )}
+              { contacts }
+            </div>
+          </div>
+          <div className={classes.addControls}>
+            <div className={classes.addSealed}>
+              { state.sealSet && (
+                <Switch label={state.strings.sealedTopic} size="md" labelPosition="left" onChange={(ev) => setSealed(ev.currentTarget.checked)} />
+              )}
+            </div>
+            <Button variant="default" onClick={() => setAdd(false)}>
+              {state.strings.cancel}
+            </Button>
+            <Button variant="filled" onClick={addTopic} loading={adding}>
+              {state.strings.create}
+            </Button>
           </div>
         </div>
       </Modal>
diff --git a/app/client/web/src/content/useContent.hook.ts b/app/client/web/src/content/useContent.hook.ts
index 5d992d96..f5a2b633 100644
--- a/app/client/web/src/content/useContent.hook.ts
+++ b/app/client/web/src/content/useContent.hook.ts
@@ -25,12 +25,12 @@ export function useContent() {
     layout: null,
     guid: '',
     connected: [] as Card[],
-    connectedAndSealable: [] as Cards[],
+    sealable: [] as Cards[],
     sorted: [] as Channel[],
     filtered: [] as ChannelParams[],
     filter: '',
     topic: '',
-    sealable: false,
+    sealSet: false,
   });
 
   const compare = (a: Card, b: Card) => {