Is he registered with the Jockey Club? If so I would just contact them or what ever registry he is in. They should be able to tell you how to proceed on getting him signed over to you. I think the Jockey Club registry you don't have to send anything in, you just have to have the papers with the horse. The breeders name is the one on the front and owner transfers are on the back. Its been awhile since I had a TB so things might have changed though.
"Until one has loved an animal, part of one's soul remains unawakened..."
- Anatole France