Hello there, Arthur!
It is a pleasure to welcome you to planDisney. Thank you for stopping by with your first question and allowing us to help you plan a magical Walt Disney World Resort vacation!
There are two easy ways to link 
theme park tickets to your account. You can link tickets online by 
signing in to your Disney account and visiting 
Link Park Tickets. You will be required to enter your Will Call Confirmation Number or Ticket ID. If you bought tickets online, your confirmation number can be found in the purchase confirmation message sent to your e-mail address. If you have physical admission, locate the 12-digit ID number on the back of your ticket. To link tickets via the My Disney Experience app, open the app on your mobile device, tap the three horizontal lines at the bottom of the screen, select 
Tickets and Passes, tap the plus sign at the top of the screen, and select 
Link Tickets & Passes.
planDisney tips: If you have purchased tickets for more than one Guest, 
add them to your 
Family & Friends list before linking admission because you will have to assign tickets to those Guests. After successfully linking tickets, be sure to make 
Theme Park Reservations for each park you plan to visit. To 
access the magic and enter the theme parks, you will need a physical ticket, a 
Disney MagicMobile pass, or a MagicBand.
I hope this information is helpful, Arthur. Come back to visit us if you have additional questions, we are delighted to help!
Best magical wishes,
Thiana