I made our reservation for Coronado Springs (Nov 19-22) on-line before we knew if we planned to rent a car and now I would like to add Magical Express transportation from the airport at arrival. But I can't seem to find where/how to add it on-line. We will be moving onto AK Villas Kidani for 5 more nights after that so I figure I need to call DVC member svcs to add on our pick up to return to the airport. We haven't paid our vacation in full yet since the balance is not due for about a month. Do I have to pay in full before booking ME?