[Toriadavis]

Before you even get on the ship when you check in at the cruise terminal each member in your party will be given your room key. It's like your ID card for the week. Your dining rotation will be on this card.
Once you get on the ship then go straight to Rockin d bar and they will help you get a ressie for brunch.
Depending on what time you get onto the ship your cabin may not be open immediately. We arrived on the boat around lunch time they basically let you play in the pool area or go to they dining rooms where a buffet lunch is provided-they will have your hallway blocked off to your cabin until your rooms are ready.
After the first day you will most likely handle any other ressies with Guest services. They are there to help you in every way possible.