Hey there Reyna! Thanks for stopping by with your question.
You can definitely upgrade your tickets to Park Hopper tickets and actually, I recommend it! To upgrade, you would need to visit the Main Entrance Ticket Booth and present your tickets to a Cast Member to upgrade your ticket. While you are there you could then purchase the two extra tickets or do it in advance online. Then, as you mentioned, you would just link them to your account on the website or Disneyland app to complete your party and make your park reservations.
I do want to remind you that park reservations are required for all tickets and unfortunately if you upgrade your ticket, your reservation will be canceled for those tickets. I would recommend keeping an eye on the
Theme Park Availability Calendar to make sure that there is still availability for the days you want before you go. You would then need to make new reservations for your newly purchased and upgraded tickets. If you have further questions about the upgrade process you can contact a Cast Member at
Ticket Services for further information.
Be sure to keep checking
Disney Parks Blog for any upcoming Disneyland announcements, such as entertainment and food, to see what may be happening during your visit.
Reyna, I hope this answer helped. I love helping Guests like you be as prepared as they can for their trips to The Happiest Place on Earth, so stop by again if you have any other questions. You've got a friend in me!
Carrie