On my DME, I have the option, even after online check-in is complete, to modify it. If I open up "My Reservations" there's a link that reads, "Update Check-In." If I click on it, it pulls up a menu showing what details are on file: "Room Notifications," "Hotel Account Charges," "Your Resort Arrival," "Room Location Requests..." etc. I can click on "Show Details" and then change my initial selections. (The option to select a particular village is under the "Room Location Requests" heading - just don't be fooled by some of the illusory choices, e.g., "near elevator" when there are no elevators at CBR, or "Martinique" if you haven't booked a preferred room.) I assume that you'd have the same options regardless of the character of your reservation, since I have the same link/menu for my upcoming room-only at CBR that I booked directly, as well as for an upcoming package stay at CBR which I booked through a TA...