When you check-in, each person's meals will be pooled, and each person will receive a key card that they can use to charge meals to - just tell your server/cashier prior to ordering that you're on the dining plan. Anyone in your party can use meals from the pool at any time up until midnight on the day your check-out, so you could go back to the parks after checking out and still use remaining meals. Your receipt will show the remaining meal credits.