Sorry If this is the wrong section, couldn't really figure out the correct one.
So my dad decided to join xbl to get some of the dlc for dragon age 2. He created another gamertag on his computer and bought the dlcs and queued them up. I cant figure out now how to get this new gamertag from his computer to the xbox. I can only figure out how to create new ones and not bring over an existing one.
Any help is thanks.