type in 192.168.0.1 or something simliler to it in the adress bar.
Type in password.
In the advance section, look at the left. there will be dmz.
Click it and set it to you ip and enable it.
restart your server and own some noobs (like you)
This is not for all the routers. this is how i do it. My router is a D-link. The steps varies depending on your router

if ya need help, send me pics of ur router (192.168.0.1 not hte real router) and ill make steps for that.
PICS WILL BE ADDED LATER