how do I go back in my 1040 form line 32 and correct the amount I typed in on line 32 for the extension payment

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 the screen where you enter Extension Payments.

To enter the amount you paid with an extension (including state extension) go to

Federal Taxes (or Personal Tab for desktop H&B version)

Deductions and Credits

Then scroll way down to Estimates and Other Taxes Paid

Other Income Taxes - Click the Start or Update button

Next page second section Payments with Extension

Either Visit All or Click Start or Update by the extension you paid

For 2024 Federal Extension payments should be on schedule 3 line 10. And go to 1040 line 31.  Line 32 is the total of lines 27-31.