Open the discussion's menu and select Delete. You can delete an entire discussion along with all responses and replies. Instructors can delete any discussion, while students can only delete discussions they've created. When students delete a discussion, other users see a message about the deletion.
To Delete Old Posts:Enter Blackboard and open the course.Edit Mode - On.Open the Discussion Board.Find a Forum that has posts. Open the forum.Click the top left checkbox to select all the threads.Optional: Uncheck any message to be kept.Click Delete to remove the student posts.
Editing and deleting discussion posts You cannot edit or delete others' posts. If you post a message in error and the option to delete it is not available to you, contact your instructor.
You can edit posts in any thread. If a student added inappropriate or inaccurate content, you can edit the post. When you create or edit a forum, you control if students may edit their published posts. Open a forum and select a thread.