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Mistakes happen. Fortunately, you can edit or delete the messages sent in Teams.
Edit a sent message
You can edit any message that you have sent to a chat or channel.
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Go to the message and select More options 
> Edit.
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Make changes to your message, then press Enter 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 
.
Undo a deleted message
Go to the deleted message and select Undo.