it does depend on the router - let us know the make and model and we may be able to help you.
Most Linksys routers allow you to access the router using
ftp://192.168.1.1 - I thinkn (plug that into your address bar in Internet Explorer). You need to enter you password to gain access (i belive default is admin) - then you go to the advanced tab and there should be a tab dealing with port forwarding - just forward port 4000 to your computers ip (in the start menu go to run, type cmd. then when the prompt comes up type ipconfig to see what your ip is - it should be something like 192.168.1.100 or 192.168.1.106.
Hopefully that will help a little - it is kinda hard to explain. :buddies: