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?
As long as you have not filed yet, you can go back in and add your medical expenses and switch to itemized deductions (the link has instructions to switch deductions) if necessary. Did you already file? If you did, you have to amend it later (after your original is processed) to make the change. See How to Amend
If you haven't already filed, you can visit the medical expenses section to add the expenses.