You can hover over your username in the blue bar above. A drop down menu should appear. Pick "settings" and this will take you to Accounts. Just under where you can upload a new profile picture you will see Reset/Remove course.

For picture instructions as well as some cautionary notes, check out the Wiki's FAQ and choose the Lessons/courses tab. In the contents menu youll see "how do i reset or removing a course" (#7 on the menu at the moment) . I hope this helps! ^_^