Where do i show estimated tax payment I made for my 2019 taxes?

What are you doing??   Online TurboTax is only for 2020 returns.

Are you mistakenly trying to prepare an original 2019 return in Online TurboTax?  If so, that's a no-no!!

If you need to prepare an original 2019 return, that requires 2019 desktop software (CD/download).

You would need to amend your 2019 tax return to add the estimated tax payments made for tax year 2019.

See this TurboTax support FAQ for amending a 2019 tax return - https://ttlc.intuit.com/community/amending/help/how-do-i-amend-my-turbotax-online-return/01/27577

Are you just now preparing your original 2019 tax return, or did you already file a 2019 tax return, but now you want to add the estimated tax payments?