Trouble with dominos app

iOS and iPadOS

I have tried to order from Dominos a couple of times. The app will not let me select a delivery time. The screen shows several choices such as now, ASAP, in an hour, etc. The now button is checked, and I can't check another button.
I have an iPhone 8 with IOS 14.2. Is it me, Dominos, or the phone that is the problem?