Registering for a course as an existing user
Go to http://my.compclassnotes.com/ and log in.
Next to "My Classes" you will see a green "Add a Class" button.
Click the button and enter the course code that was supplied by your instructor.
The course will be added to your list. Some classes require payment before you can access the content.
See the article on how to pay for a course if needed.