Actually there is no way for you to clear your room requests by trying to update your Online Check-in request(s) once you have completed your Online Check-in. If you know what your requests are now, call reservations, and have your request(s) noted on your reservation now.
Then two (2) weeks before your trip, I would suggest you call reservations, and confirm that your request(s) are noted on your reservation.
This is the best way to have the highest chance of your request(s) being met. If you have more than (1) request make sure that you put them in your order of preference. Once you get to your resort it is also a good idea to stop by the Front desk, and confirm your requests with the CM, and ask if your assigned room matches any of your request(s) or if there might be a room available that might meet your requests. They do have some flexibility to adjust your room assignment dynamically if there is room inventory that might match as of that specific time.
Dave