Port Forwarding

[PatientZero]

Need more details.
Like, uh, any.

What OS are you on? Behind a firewall? Which Firewall? Behind a router? Which router? What port are you trying to forward? What kind of connection? Wired or wireless?

That said, usually it's a simple case of going to your router control panel (try routerlogin.com), checking the connected devices for your internal IP and then adding that to the port forward list, maybe even temporarily setup a DMZ for your IP to check nothing else is causing issues, aside from that I have nothing to go on to even guess at the problem you're having.