Discussions are course-level message boards that can be accessed within your course session. In order to access your course, go to My Courses and click on the icon representing your course.
Once you've opened your course, click on the Course Menu button (icon with three horizontal lines).
Click on Discussions to open the list of course-level discussions.
Click on the discussion you'd like to view, or create your own discussion by clicking on the + icon (top-right).
If you open an existing discussion thread, you can respond to it using the field at the bottom of the screen.
Once you've entered your course dashboard, click Discussions in the menu on the left. You can now view existing threads, create your own (Create+ icon), or comment on an existing thread.