You can "announce" things like messages you've sent and received, polls you created, and events so they permanently appear at the top of a chat.

To announce messages:

1. Tap and hold the message you want to announce.

2. Tap Announce.

To announce polls:

1. Tap "+" at the bottom of the chat screen.

2. Tap Poll and then the poll you want to announce.

3. Tap Announce > OK.

Note: The Poll feature is available in group chats.

To announce events:

1. Tap the menu icon at the top of the chat screen.

2. Tap Events and then the event you want to announce.

3. Tap Set as announcement > OK.