Hello Wassim!
Welcome to planDisney! I'm hoping you get a chance soon to visit
Walt Disney World Resort. It's so frustrating to have plans change but as long as you did not use your ticket there is still a chance to make changes. Just so you are aware, if you change the ticket dates to a date where is there a different higher price for the ticket you will have to pay the difference. Unfortunately, if the price is lower there is no refund of that difference.
I don't know where you purchased your ticket from but you have to make any changes through the way you made them. If the ticket was from a travel agent, travel wholesaler, or someone who is not a Disney ticket seller then you will have to reach out to them to make any changes.
If you purchased directly through Walt Disney World Resort, you can enter through your
My Disney Experience Account and make changes right online. Scroll down and look for "
Tickets, Passes & Memory Maker." You should scroll down and see all your tickets for yourself, your family, and anyone you are linked to and manage from your
Family & Friends list. Under the ticket you can click "Change Ticket." From there you should be able to see a calendar with the cost of what the increase in price would be, submit changes, and pay the difference if there is one.
As always, if you have any problems you can
reach out to Walt Disney World Cast Members for assistance.
I hope this helps and that you have a magical time very soon!
Happy Planning!
-Nimmy