The search option tells me to enter estimated tax payments under the Deductions & credits on the online version, but there's not where to enter Estimated Tax Payments.??

[thomashollander]

Where do you enter the Estimated Taxes you've already paid?

[AnnetteB6]

See the following TurboTax help article to get started, the payments already made are entered under the Deductions and Credits section:

Where do I enter my estimated tax payments?

[SteamTrain]