To reschedule a Disney Park reservation in 2026, you must use the My Disney Experience app or the official website. First, navigate to the "My Theme Park Reservations" section under the "My Plans" tab. You will see a "Modify Reservation" button next to your existing booking. This allows you to select the members of your party and view a live calendar of available dates and parks. If your new desired date is available, you can select it and confirm the change without having to cancel your original reservation first—a major improvement in the 2026 system that prevents you from losing a spot while "shopping" for a new one. Note that your ticket must still be valid for the new date, and if you are moving from a "Standard" day to a "Peak" day, you may be required to pay the price difference. It is essential to check the Availability Calendar before starting this process, as popular parks like Magic Kingdom often reach capacity weeks in advance.