After you have logged-in, you can join courses.

Opening the online courses page, all the available courses will be displayed in the main window.

Each course has two links, as you can see in the picture below:

1. Read More - where you can find out more information about that course.

2. Join Course - the link you have to follow in order to enroll to that course.

Thus, the page for joining a course will be displayed and all you have to do is press the button "Join ...".

You may join as many courses you wish, but you have to join each course separately, in order to join the team of that course.