Method 2: The first time you attempt to connect to any of the game's online modes, the game will ask for your product code. (It is also assumed that this is where the Premium G Sound pack will be located as well) Under 'accompanying content', the online pass will be available for download. Method 1: Navigate to "Kidou Senshi Gundam Extreme VS Full Boost Preorder Tokuten" in the PSN Store. At some point on January 30th 2014 the Online Pass will be made available for download for these users. Only the SEN account that has the preorder on file can download this pass at no cost.
The EXVSFB online pass will need to be downloaded separately from the game software itself. The online pass will automatically be registered to the Sony Entertainment Network account you used to purchase the game. When this happens, please reference the included Online Pass ticket that came inside the game package and enter the code on the ticket. The first time you attempt to connect to any of the game's online modes, the game will ask for your product code. The method for registering the pass is different based on whether you purchased the packaged version or the download version, so please refer to the following directions for your edition. In order to enjoy the online modes of this software, EXVSFB, it is now necessary to have an online pass for the game.
How to set up the online pass (from gamefaqs)