TTax won't let me enter medical expenses

Answered "No" at first when asked if medical expenses were greater than $xxxx.xx because I didn't have them at hand. Now I want to change my answer, but TurboTax Home & Business 2023 Desktop won't let me. When I click on Update, it simply tells me "Thanks, we got all your Medical Expense info." Seems like a defect. How do I get around this? Thanks for your help.