First check and make sure it isn't already linked to your
MDE, I ordered mine and it was linked automatically. If you go to the "My Reservations and Tickets" page it would be all the way at the bottom of the page. If you don't see it there you can link it by clicking on this link:
https://disneyworld.disney.go.com/link/ and linking it. It is linked to your entire MDE famiily and firends list, but you need to assign a person to "manage" it.