I found it. Go under Personal tab in your tax file.
Go to Deductions & Credits.
Scroll down to Estimates and Other Taxes Paid
Go to Other Income Taxes and click on the Start/or Update button to the right.
Another page will come up with Payments with Extension and then there will be one for Payment with 2018 federal extension followed by a blue Start button......
Next page you will enter the amount you paid with your federal extension. There are also buttons for state if you paid any extension there too.
From there you should be on your way......
I entered my amount and that brought turbo tax back down to zero on my federal refund all ready for me to make an adjustment to pay them more.....oh boy.....
Hope that helps you too!!
