You must have a resort reservation number to do this ahead of time, if you booked a package and not room only you are given a conformation number with both letters and numbers, this is different from a room only because we contain letters and numbers while room only is a string of numbers. Those of us with a package will be asked if we are planning on a qs lunch during our stay at check in, and if the answer is yes the cm will give you a small almost flyer like piece of paper with the website url i posted earlier as well as the resort reservation number the cm will write down themselves. you then get on your device, whether it be a smart phone,tablet,or laptop, and log in just as the few lucky ones on here have done and begin your reservation for lunch.
I hope that helped any confusion!