How do I Unmark Estimated on the Federal Carryover Worksheet? I would let me file and I don't see how to unmark as estimated.

If you are using a desktop version of TurboTax and the message is coming up during the Final Review, be sure that the value entered in the field is accurate.  Then, click on the red highlighted field in the form shown on the page with the error.  Next, go to Edit > Unmark Estimated from the menu at the top of the screen.  Repeat if there is more than one error.