Delete a message
Long-press the message you want to remove.
Tap Delete.
Confirm when prompted.
The message is replaced with "This message was deleted" for everyone in the chat. This is permanent and can't be undone. A deleted message can no longer be edited or reacted to.
Note: You can only delete your own messages. Group admins can delete any message in their own group chats, and club admins can delete any message anywhere.
FAQ
Can I delete a message the other person has already seen?
Yes. It will disappear from their screen as well, replaced with the "deleted" placeholder.