Hi Andrea!
You can modify your
Walt Disney World reservation on the
Walt Disney World website. Log into the site with your email and password and click on "My Disney Experience" in the upper right-hand of the screen. While you are in your My Disney Experienced account, scroll down and you will see your upcoming reservation.
From there, you can click on "Change Reservation." You can modify the vacation offer, travel dates, number of people in your party, resort, or room type. Once you make your changes, you can check-out and see the price difference between your original reservation and your new one.
I see that you are visiting in May, which means you can enjoy
EPCOT's International Flower & Garden Festival. This fun event offers live entertainment, yummy foods served at the outdoor kitchens, and topiary displays.
I hope you have a magical vacation!
Magically,
Stacy