In general, firstname.lastname is the username. However, if there's someone else who has the same name, you'll sometimes get a 2 at the end, which is possibly the problem.
I don't know which staff will be there tomorrow, but I suggest calling or emailing Kelly Edge (extension 22401,
[email protected]) or Linda Harwood (ext 22699,
[email protected]). I'm not 100% sure they'll be able to help you, but hopefully they'll at least be able to point you in the right direction. This late in the year though, you might not be able to get access until Term 2.
Hope that helps!