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Edit a sent message
You can edit any message that you have sent to a chat or channel.
Hover over the message you want to change and select Edit.
Edit your message, then select Done to save the update.
There's no limit to how many times you can make changes to a sent message.
Delete a sent message
If you need to backtrack and delete something you just sent, go to the message and select More options > Delete.
If you haven't sent the message yet, select Format to expand the box and then select Delete in the upper right-hand corner.
Undo a deleted message
Go to the deleted message and select Undo.