Hello there, Yeonseo!
Welcome to planDisney! Wow, that's wonderful that your cousin gifted you her Disneyland Resort Theme Park Ticket! I'm sorry to hear that she couldn't make her original plans, but how generous of her to think of you. I hope she will be able to visit sometime soon.
I'm happy to report that the name attached to the ticket does not have to match the Guest who uses the ticket, so you will be fine. Even though the Disneyland website will ask for a name to be attached at the time of purchase, this is not set in stone and you will be able to use the ticket if it is unused and attached to your Disneyland account. The only time that the Cast Members will ask you to show ID would be for military tickets and special location based tickets like the
Southern California Resident Ticket Offer. I'm also glad that you received a
tier 6 ticket, meaning that there are no blockout dates for you!
Which Park will you be visiting? The
Disney California Adventure Food & Wine Festival is going on during your visit, so if you consider yourself a foodie, consider heading over there to sample some
delicious offerings! If you find that you need to change your reservation or Park selection, just head over to
Ticket and Reservation Details and click on "Make or Modify Park Reservations."
Yeonseo, I hope that I was able to answer your question and reassure you. I wish you a truly magical time when you visit the Happiest Place on Earth! If you need anything further, please visit us again because we'd love to hear from you.
Wishing You a Great, Big, Beautiful Tomorrow!
-Al