|It is generally the same on MOST routers,|
If you are running a Windows based PC go to command prompted.
(Windows Key + R > type in CMD, press enter > type in ipconfig > Look for Default Gateway, and this should be the i.p of your router. (Something like,
Default Gateway:: 192.168.1.1)
Type this number into your web browsers URL
Type in your Username and Password, this should be printed on your router.
Find one of these,
Then type in the port you want to forward, and the i.p address for your ps3 and the type is TCP for the port 5223 and UDP for the other ones, click add.
(For this game, you need to individually forward these ports, 5223,3478,3479,3658)
This should be all you need to do.
If its not broken, Fix it until it is