If anyone is still able to this (online browser), please report. After choosing the date and the park, I get "Daily FastPass+ Limit Reached
Guests can only plan 3 FastPass+ experiences in advance per day. To continue, remove them from your party. Their existing plans won't change. (Note: I have no others in my party.) Or, go back and cancel an experience they planned for this date."
Remove from Party (Option for each of three guests booked for the park that day.)
Start Over Back (available choices) Next (not an available choice).
OK. Apparently, I can see available rides/times by simply choosing "Modify" on one on the passes for the park on that day.