Have not cruised with RCCL in a long time. I have two questions. We may need to change from anytime dining to early assigned dining. It appears that earliest time for anytime is 6:45P. We have a diabetic who may need earlier time. Cannot find any way to do this online? Do we have to call to make the change? Also, I downloaded app. Both reservations are showing but I can do nothing. I thought you could make reservations for dining, excursions, etc through app prior to sailing. We sail Nov 16, 2022. Any help appreciated...thanks!