Hello Shane! It sounds like you are going through all of the right steps to plan your upcoming visit to the Walt Disney World Resort! You're going to have a great time!
In order to experience any (or all) of the four Disney Parks, you must have both a valid theme park ticket and a theme park reservation for the day that you wish to visit that particular park. It sounds like you've already purchased your tickets. You can make your park reservation by visiting the
Disney Park Pass Reservation System.
Once you have your tickets purchased, you should see the tickets as part of your
My Disney Experience account. If they are not automatically linked for you, you can go to your My Disney Experience account and link the tickets. When you go to the menu, click on "Tickets and Passes." You can then click "Link Tickets and Passes." You will be prompted to enter the ID code that you would like to link.
Shane, you might not be doing anything wrong! Sometimes Stitch gets into the system and makes things a little difficult! If your attempts to continue to be unsuccessful, I suggest that you contact one of the friendly Cast Members at (407)939-6244 for additional assistance. I am sure they will be able to guide you in the right direction!
Hakuna Matata! Jonathan G.