Hi Sandra and welcome to planDisney!
How exciting that your visit is coming up so soon! Summer is such a fun time to visit the Walt Disney World theme parks and no doubt you will have a blast at
Disney's Hollywood Studios in a couple of weeks.
Walt Disney World is certainly understanding when plans suddenly change and need to be moved around, so changing your ticket shouldn't be a problem. In my experience, a ticket that went unused and is past the date it was intended for will drop off of your My Disney Experience account. If you don't see your ticket in your account, you will need to
call Walt Disney World for Existing Tickets to speak with a friendly Cast Member who can assist you in modifying your ticket. It's handy if you have your original ticket purchase confirmation email available for the Cast Member to help locate your ticket. Changing your ticket will be subject to any price difference between what you originally paid and the current price, if there is a difference.
I would also like to note that
Theme Park Reservations are still required, so once you get your new ticket set up, you will need to make yourself a Theme Park Reservation for Disney's Hollywood Studios for your upcoming visit. Since summer is a busy time of year, it's best to secure your reservation as early as possible. As of now, it looks like all parks on June 20th are open.
Please
stop back by and visit if you have any additional vacation planning questions.
Have a magical day!
Leslie