so I need some help here I just recently purchased a ff14 pc game and 90 day sub. I recently got a physical copy for my ps3 i would like to link the account so I can play my pc account on my ps3. Now i have read multiple threads but cant find one that is solid

so for instance my square enix account is already made for my pc account. I also have a sony network account on my ps3 pre existing. so my ps3 version comes with a product code where do I enter this ??

I read from different forums and I got 2 answers that I enter this into my mogstation under add new service account.

The other is that I enter it into my sony network account maybe under redeem product code ??

The other issue Im hearing about is the steps of installation do i have to register my account i guess in either way posted up top if thats even correct before i physically put the disc in and install ??

if anyone can shed light on this issue or just flat out give me a step by step i would appreciate that