is there a way to delete a message already sent and to delete something you posted to someone thread?

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AbieAJ Premium Plus
Nope you cannot delete a message that's already sent, however you may delete or edit something that you posted.

Bear in mind, comment/s you deleted even after editing will still show in their notification.

In actual fact you may have erased it, however it will still be seen.
Newme202 Premium Plus
Yes. There's a arrow beside the comment that you posted. Click it and you will see the words: edit or delete