2 Dreamhost Accounts Creating an Issue

I seem to have worked myself into a dilemma. I’m developing a website for a friend. He wanted to register a different URL, and switch his site over to that new location. He wanted to register the domain under his name, and not mine. So, he created his own account on Dreamhost and purchased the domain. It’s currently parked. How can I get this domain over onto my account so that I can work on it?