How to change medical expense after finish deduction section?

When I prepare my tax 2022, I calculated my medical expense, I forgot one expense, so my medical expense does not excess the amount TurboTax asked, so I skip medical expense input. Now I think my medical expense will over the amount TurboTax asked, so I go back to the medical expense section, TurboTax doesn't allow me to change it. What I can do now?