In your Learning Plan tab, you might see a bookmark icon to "Request" a course and a note that "This course is currently full."
This means that the course is full (max enrollment reached) and you can request to be waitlisted.
Click the yellow bookmark icon to be waitlisted. If a spot opens up, you will be notified through email if you are added to this course instance/date.
Note that while you are waitlisted, you cannot register for another date of the same course.
Once you join the waitlist, you will find the course in your Active Courses tab under "Requested Courses."
You can choose to leave the waitlist by clicking on the red Cancel Request icon.