Once the desired course is found, click on the corresponding box.
The course will then be displayed with a description.
Click the "Sign up" button, and that's it!
Note: If you wish to unsubscribe from any course, simply press the "Unsubscribe from the Course" button (the same button used to enroll). *It is only possible to unenroll from a course you enrolled in yourself; mandatory courses cannot be unenrolled from*