Ok, to help you a bit... There is no online basically. the only connection is ad-hoc, meaning there would only be people on if they were playing mhfu on their psp within radius of you (i think it's 30 feet?).
To play online, you need ad-hoc party on your ps3 OR xlink kai on pc (i sugggest ad-hoc party if you have a ps3. xlink kai is a pain to set up).