first you need a playstation store account, which can be created on the psp if you dont have one yet, and the latest software update on the psp, which can be aquired by going in the main menu, all the way to the left menu icon "settings", then all the way to the top to "network update". (you need wireless internet to do all of this. sorry if you dont : / ) once you are in the playstation store, go down to "demos", then youll soon find monster hunter