If you want to get an account, just send an email to staff@cs.au.dk stating why you need the account (i.e. student attending a computer science course), your student id number and your name.
In return you'll receive a ticket (i.e. 9303ac39) which you can use at the website https://ssl.nfit.au.dk/ to create a username and get a password.
Within a few minutes the account will be ready for use.
(If you are attending one of the large courses, please check with the teacher or instructor first. You may already be on one of their lists.)