Where do I enter prepaid tax amounts paid during 2020 on the tax forms in order to get credit for them?

Did you send in estimates?

You can type estimates paid in the search box at the top of your return and click Find and it will give you a link to Jump To it.

OR

To enter Federal or State Estimated Taxes Paid, including a state estimated payment made in January for the prior year, go to

Federal on left or at top.  Personal (Home & Business)

Deductions and Credits at top

Then scroll way down to Estimates and Other Taxes Paid

Estimated Taxes - click the start button

For 2020 Federal Estimated payments should be on 1040 line 26.