For this trophy, you must upload edit data onto the online servers of the game. In the online server menus. Choose the upper option from here, and then the upper option again. You will be shown three slots, each of which represent your online uploads. They should all be empty at the moment, but to upload one, select the leftmost option on one of the slots and then select your edit data. The game will then process and upload it, unlocking you the trophy.