The Final Review may just be asking you to confirm the amount that is entered there, and not necessarily to make an entry. If the field is blank, you may be able to Continue past this screen (it probably means you had no carryovers from 2020).
Your 'Total Withheld' is on your 2020 Form 1040, Line 25d. Your 'Total Payments' would be on Line 33.
Federal Carryovers can be losses, deductions and other entries, that are carried from last year to be used this year. TurboTax prepared a Federal Carryover Worksheet for you in your 2020 return, if you want to review it.
Click this link for more info on the Federal Carryover Worksheet.
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