Also see our help guides on Forum Subscription and Tracking and Email Replies to Forums.
Note: If you only see one discussion thread (started by your instructor) and no “Add a new discussion topic” button, your instructor is likely using a Q&A Forum. You will need to reply to your instructor’s post in order to see the posts of your peers. If you do not see the "Add new discussion topic" button or any posts to reply to, you should contact your instructor.