Yes, just open your emailed offer, then open "Offer Details." Fill in the boxes for zipcode and name, then, in another tab or window, open your existing reservation in MDE. Go through the steps to change the reservation, selecting the option to change the vacation offer. The next page should show you all available offers, including the "Enchanting Room Offer." Select that offer to see if your reservation can be changed to the UOC.Do you know if there's a way you can add it to an existing booking online? I'd prefer to not call in if I don't have to!