how do you go online

same here, although i dunno what to get, this or field commander

do you have a router? if you do then set up a connection through the main menu do as it says, then enter the game and it should say something bout the online game play. then that should take it from there, quite simple really

Wireless internet is a must have for Infrastructure play. You must set up a connection with the router through Network Settings on the Main PSP Menu.
However, there is a rather popular way of getting round this. Pretty much any game that has Ad-hoc can be played online. There is something called Wi-fi Max, which is a USB that you plug into your PC or Laptop. Set up a program called X-Link Kai, and you're ready to go.
There is plenty of information about this on a thread in the MHF forum, entitled "Online Enabled?"

thank you both