Hey guys, my physical copy of HW came today but I have no idea how to register that I have the game (and change EA to the full game)

Do I just put the disc in? Enter a code somewhere? Obviously I must have already done it when I changed from EA of ARR to the full version but I can't remember how I did it.

Have any of you done this yet after receiving your physical copy on PS4?

I'm in EU if that helps...