Hi Livka,
Welcome to the Disney Parks Moms Panel and thank you for sending us your question. How exciting that you are extending your visit to Walt Disney World Resort, more time at the Theme Parks means more magical memories being made with your family!
It sounds like what you need to do is upgrade your existing
Theme Park Tickets to add an extra day. Unfortunately, this cannot be done online, so you will have to wait until you arrive at Walt Disney World Resort to add the extra day. Guests are able to upgrade existing Theme Park Tickets if there is at least one day left on your Theme Park Ticket and it has not been 14 days after first use. To upgrade your Theme Park Tickets, please visit a Ticket Window at any of the four Theme Parks, any Guest Relations at the Theme Parks or Disney Springs, or the Resort Hotel Lobby Concierge. The Cast Members will be happy to add the extra day to your Theme Park Tickets. Please remember that you will be responsible for any additional charges that results from upgrading your Theme Park Tickets.
I hope you have a fantastic time at Walt Disney World Resort, Livka. Please let us know if you have any other questions, we are always happy to help.
Stephanie