Access to courses is provided to students who are formally enrolled in the Master's Programme. To log in to the site, go to the Log In link and use the LinkedIn option. You can use your LinkedIn login details directly. A successful login would mean you already have a moodle account.
In order to get access to a specific course, you have to be enrolled by the course lecturer manually.
If you do not have access to a course (and you think you should have such), please write to System Administrator when you log in to your profile. Note that only currently active courses offer enrollment.