Hi getfuzzy, You are right, there is no place to put it on the FunPass. When you originally booked they should have asked you. Or if you booked directly there should have been a place. If you did either, you are good to go. No worries either way, just call your booking agent, or CCL if was direct, and confirm it is on your reservation.
Use this number 1-800-327-9501 it is much easier.