You can enter the estimated taxes you paid by following these steps:

• In TurboTax, open your tax return
• Click on Federal in the left-hand column, 
• Choose Deductions & Credits on top of the screen
• Scroll down to All tax breaks, locate the section named Estimates and Other Taxes Paid and click Show more
• Click on Start next to Estimated Taxes 
• On the next page, click Start next to Federal estimated taxes for 2017 (form 1040ES)  ( There is also a section for your state taxes)