If no one has voted in a poll yet, it can still be edited by the person who created it.
Note: The poll cannot be edited after someone has voted in it.
To edit a poll:
1. Tap "+" at the bottom of the chat screen > Poll, or tap Vote now at the bottom of the poll message that was sent.
2. Tap the poll you want to edit.
3. Tap the menu icon > Edit.
4. Edit the content of the poll and tap Done.
You can allow anyone in the chat to add poll options by checking Allow new options when you create a new poll.
Note: In this case, options can be added even after people have voted in the poll.
Let us know if we can make it better.