If you just let the broker/escrow agent know that you want to put it under your trust, they will handle it for you. You just have to tell them how you would title it exactly, which should be described in your trust documents (for real estate purchases). For ours it's like "Bill Jones and Nancy Smith, as Trustees, or any Secondary Trustee, of the Jones-Smith family trust under agreement dated 1-2-1989", but your lawyer may have recommended something different
Edit: wasn't clear if this was a new purchase or existing one, but above would be for a new purchase