You don't need to do anything with your 2019 tax return in TurboTax since your already filed the tax return with the IRS.
To enter the $400 payment in TurboTax for 2020, choose these options:
1. The Federal option on your left menu bar
2. Other Business Situations on the Your income and expenses page
3. Estimated Tax Payments
4. Federal estimated taxes
5. Enter the payment in the First quarter row
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