I am living in student accomodation and we have a router here. The instructions on the site say they only work if no router is involved...is there any way to change your IP address if a router is involved?
I will guess that you are talking about your external IP address which is the one that is displayed on our home page. I will also surmise that the "Student accommodations" are probably part of a higher learning facility. This leads me to believe that your external IP may be static and can not be changed.
Is the router WAN or Internet port connected to a Cable or DSL Modem or is it just connected to a wall jack?
If "student accomodation" means university-supplied housing, then, basically, no, there's nothing you can do about that. Colleges have had to take somewhat strict measures because of all the peer-to-peer (P2P) filesharing that has resulted in lawsuits. It's most likely that your IP address on your PC is (bascially) controlled by the college, and that you're NAT'ing out using their default NAT. That is, roughly-speaking, the router that we list in our instructions. How many actual boxes/devices there are isn't really important. It's not under your control.