NY estimated payments

You will be able to edit your state tax return by doing the following:

1. Select State in the black panel on the left after signing into TurboTax.
2. Select Edit to the right of your state on the screen titled Status of your state returns and go over the state again. 
3. You should be taken to an overall summary screen titled You Just Finished Your New York Return.  Scroll down on this page to the section titled Other Forms and Voluntary Contributions
4. Select Update/Start to the right of Other Forms
5. The next page will be titled Additional Tax Situations.  Select Start/Update to the right of Estimates, Apply a Refund, Amend, Extend

Thanks for responding. TurboTax automatically divided my 2021 estimated tax liability in 4 equal payments. Since I already paid $500 online for the 1st quarter payment I've manually adjusted the first quarter with no payment scheduled and adjusted the following 3 quarters to add up to the total estimated 2021 liability. Since I underpaid on the first quarter I've increased the following 3 quarters.

Have I handled this correctly? I wish there was a way for TurboTax to record my $500 payment I already made for the first quarter of 2021.

Yes, you did that correctly. 

You should be good to go ahead with the remaining three estimated tax payments.

You can be fined for any estimated tax payment that is too small.

Adding more in the next payment to "make it up" won't work.