Q. How do I delete (or edit) a new discussion board thread once I post it?
Deleting and editing a post are features that are allowed or not by the Instructor. The Instructor has 2 settings when they create a forum, (1) "Allow Author to Delete Own Posts" which has 2 sub-settings "" and "Only posts with no replies" and (2) "Allow Author to Edit Own Published Posts".
If those are not enabled, then you can neither delete nor edit posts. If enabled, then the drop-down menu on the thread name will display an open command for editing and a delete command for removal.
Thank you for the question!