After you input the code for the PS3 version into your PSN account, when you load the game it will as you to log in with your Square-Enix account for FFXIV. Do so. Now make sure you select the same account you have the PC set to. DO NOT MAKE A NEW SERVICE ACCOUNT. After you have added the PS3 Service to your PC/1.0 account, then you can just log in like normal.