Making a hl2mp Server (not doing to good)

[GaSp]

Hey i have a verison westell Versalink 327W and I’m trying to make a hl2mp server. I can make a server (also works fine) but it ends up to be LAN, how do i change this? do i need to forward the IP? If so how do i do this? How do i change the name of the sever? If any one can help me out Plz post even if its just a bit of information, this will really help.