How do I delete a thread?

Public forum. Once created threads stay permanently unless the AT&T moderators determine something about is inappropriate. Otherwise you will still find threads from years ago.

If you want to stop receiving notices on a thread, go into your forum profile under notifications and you can usubscribe from any threads you have participated in. Doesn't delete their existence, just means you will not be notified about any new posts in them unless someone specifically references you. ( @yesquintana for example)