The Gold Boards are across in the parking garages (Separate ones for Terminal A and Terminal B). If you provided your flight info with your reservation that should determine which parking garage. If you didn't it will normally default to A. I don't have any experience with arriving at the new terminal C.

Your reservation should indicate whether you have Gold Service included with the reservation or not. If not, you will need to visit the counter in the terminal before heading to the parking garage.