Inga was on exchange from University of Wales, Bangor. There will also be exams given in the term. Students from the UK usually aim for 13 to 15 cr per term. You will be able to register using a web browser. If you don't have CRN numbers, you can just use the class search mode and it will show all available sections.
Online services can do lots of things.
You can go directly to the login page for registration.