You have to go into your router setup screen. The same location you forward ports. Open Internet Explorer and type 192.168.1.1 (or whatever your router tells you to use). It will ask for a password. Sometimes, you just type admin for username and nothing for password. Sometimes anything for username and admin for password. Your router manual will tell you, or someone who has that router can tell you. Portforward may even tell you. After you get into the router setup screen, you can follow the steps DaveC told you to do.
