I actually just did that two nights ago...like the other people said, forward port 113 to your computer's IP (192.168.0.2 if it's the first port, unless you specified otherwise), using
http://192.168.0.1, and then advanced --> ports, where you can specify numerous new ports to be used, and where the packets from that port should be sent.
Now that I have the router, my sister will never touch my computer again. mwahahahahhaha.