TurboTax won't let me enter the estimated taxes. When I click continue, it directs me back to the beginning!

To enter, edit or delete estimated taxes paid (Federal, State, Local) -

Click on Federal Taxes (Personal using Home and Business)
Click on Deductions and Credits
Click on I'll choose what I work on (if shown)
Scroll down to Estimates and Other Taxes Paid
On Estimates, click on the start or update button

Or enter estimates paid in the Search box located in the upper right of the online program screen. Click on Jump to estimates paid

Or click on Tax Tools on the left side of the online program screen.
Click on Tools
Click on Topic Search
Type in estimated tax payments, click on GO

Federal estimated taxes paid are entered on Form 1040 Line 26

@farrag-bio 

#1

IF...if you are using the Desktop software?

and

IF...if you Do see the boxes containing dates, and the payment boxes that show the text.. "$0" in them, try double-clicking on the box to bring up the Supporting Details Worksheet that might be attached to that entry.

__________________OR________

#2

IF...if you are using the Desktop software?

...Switch to Forms Mode, and enter the $$ directly on the "Tax Payments Worksheet".

____________________OR._----

If using he Browser-based Online software?

...I've got nothing other than you calling Customer Support.