Originally posted by DeeDee
I have no idea how I am connecting on the web, all I know is that my Airport card detected a network and just connected.
This sound like someone else in your building has a wireless router that is hooked up to the internet and that router is not secured with a password so you are able to use that person's internet access.
In principle, the port forwarding you have to do for eMule on windows and for aMule on OS X is virtually identical. You need to configure your router so that the necessary ports are forwarded to your machine. This however requires physical access to the router. Given that you don't even know who's internet access you are mooching, this could prove a little tricky.

So I guess you need to get your own internet access and your own router. Then you are able to configure the router however you like.
Also, using someone elses router for p2p is not exactly a nice thing to do. I used to have my router set up to be open for other people in my building, but then someone tried to use it for p2p, which made my internet access noticeably slower, so I had to lock it down.