You actually enter these when you're working on the federal portion of your return.
With TurboTax open, you can either:
- Click Federal
- Click Deductions & Credits
- Scroll down to Estimates and Other Taxes Paid and click the box
- Scroll down to Estimated Tax Payments and click the box
- You'll see State estimated taxes for 2019. Click Start to enter your information
OR
Click Pick up where I left off in TurboTax Online, type estimated tax payments into the search box, and click the Jump to estimated tax payments link.