You don't enter it on the screen for quarterly estimated tax payments. It goes on a different screen. Go to Federal Taxes > Deductions & Credits. On the screen "Your 2024 Deductions & Credits" scroll down to the section "Estimates and Other Taxes Paid." Click the Start button for "Other Income Taxes." On the "Other income taxes" screen scroll down to "2023 Refund Applied to 2024." Click the Start button for "2023 refund applied to 2024 federal taxes."
