Is this your first time here?
You can login with your CS department account that you also use to login e.g. to the OwnCloud, GOGS, or possibly other Moodle pages (i.e. your official s8xyabcd username with the new password you got from the CS department). If you do not have, or are not aware of having, such an account, click here and enter your UdS eMail address. If you don't get an error message (e.g. "no user found"), you will receive a new password within a few minutes.