You can edit any message that you have sent to a chat or channel. There's no limit to how many times you can make changes to a sent message.
Hover over the message you have sent. A floating options bar will appear. Select More options , then Edit.
Make changes to your message, then press Enter or click on the checkmark to save the update.
You can backtrack and delete something you just sent.
Hover over the message you have sent. A floating options bar will appear. Select More options , then Delete.
If you haven't sent the message yet, select Format to expand the box and then select Delete .
Go to the deleted message and select Undo.