Hey there Jennifer,
Welcome to planDisney and thanks so much for your question! First of all - congratulations! What a cool job you must have to be able to win tickets to the Happiest Place on Earth! You're going to have such a fun time.
Typically, standard theme park tickets are able to be upgraded with the
Park Hopper option even after they've already been purchased. If these are just your normal, everyday park tickets then you should likely be all set to upgrade! However, if these are special promotional tickets of some sort, it is possible that some exclusions and limitations may apply depending on the ticket type.
Your next step will be to
reach out to one of the friendly Cast Members at the Tickets line. They'll be able to see the specific details of your situation and let you know if your tickets are able to be upgraded or not.
Currently, you need both valid theme park tickets and
theme park reservations for each day that you plan to visit, so after you chat with the Cast Member at the Tickets line, be sure to check the
My Plans hub to set up (or confirm) those Theme Park Reservations are set for when you plan to use your tickets.
Thanks again for your question, Jennifer! I hope you have a fantastic time at the Disneyland Resort.
Have a Magical Day,
Greg