Hi Ju, welcome to planDisney!
I'm uncertain of the exact change you are hoping to make to your
theme park tickets, but I'll try to go over the different options you have available.
If you need to change your current
theme park reservations, then first log in to your Disneyland Resort account, select the "My Disneyland" link, and then click the "Ticket and Reservation Details" link. Select the reservation you wish to cancel and click "Cancel Reservation". Once canceled, you're free to go ahead and book your new reservation.
If you need to change the Guest name you assigned to the tickets, no action is needed on your part! Assigning names to tickets is more to help Guests organize their party members. When you go to the
Disneyland Resort Main Entrance Turnstiles, the Cast Members will scan your tickets and take a picture of each Guest to actually assign the ticket to them. So even if you initially assigned the wrong Guest name to your ticket, you should be good to go.
Lastly, if you're needing to upgrade your tickets, you can either visit the Disneyland Resort Main Entrance Ticket Booths or give the
Disneyland Resort Ticket Line at 714-781-4636. The amazing Cast Members should be able to help you out!
If by chance the above items didn't cover what you were hoping for, please visit us again!
See ya real soon!
Jin