Hello! I'll start by saying I'm new to Ubisoft's PC gaming, but a long time fan of AC. I've switched to the PC because my PS3 was stolen, and when we got it back, it was broke. :/ People suck.
Anyway, some of you may or may not know about the huge Steam sale that was going on last week, and during it I bought AC Revelations -- Gold Edition. It includes all of the DLC for Revelations, and it provides me with various product keys to unlock that content. My question is, though, how and where do I enter those product keys to unlock my DLC? I have them, and although Steam tells me I'll be able to enter them at some point during the game, I'm not seeing it, and I'd really like the DLC for the muliplayer activated. And Google is NOT being very helpful.
So, long story short: how do I enter product keys for the DLC? I'm stumped on where to find it, and I don't really understand Ubisoft. Please and thank you for all the help in advance.