If you cannot login using your user/pass - try to use different browser, like IE. If you are using Firefox and cannot login - here is how to fix it: mozilla support.

Please, check if your e-mail addresses are correct. If you provided not existing e-mail address we cannot contact you (in case of exams changes).
To change the e-mail address: Login and go to "Account" page ("Persönliche Daten")

You can login with your OLD username (Matrikelnummer) and password.

In case of any problems concerning new registration system (or suggestions), or if you found some mistakes / bugs - please contact us (preferably in English) from here