You can only make reservations if you are a passholder. We have Plat passes and I,m not sure if the other types of passes can make ressies or not. Other than that you have to make your reservations first thing in the morning at guest services.
you have to make the reservation on the day. we went to it at about 10am to book a table for 3pm and had no problem. and the last reservation is taken for 5pm (as far as i rememeber).hope this helps