Others will want you to include setup for your computer. I know you are a new Mac user, but there are some things you can find out.

Exact operating system (If you have no idea then just the Name and model of the computer) This will help them to help you set up your firewall.

Limewire version and Java version (In your Limewire go to Help>about Limewire) it says there the versionnumber for both.

Also what exactly does the pop-up you keep getting say?

Any more details that you can think of that might help.

Also try to figure out what programs others are using that work in your college. Especially if anyone can get Limewire to work.