You may need to upgrade to Deluxe to enter it. If it didn't transfer over from last year then enter a refund from last year that you applied to this year here. BUT first make sure it's not already there. You don't want to apply it twice.
Federal Taxes
Deductions and Credits
Then scroll way down to Estimates and Other Taxes Paid
Other Income Taxes - Click the Start or Update button
Next page scroll down to 2018 Refund Applied to 2019
Click Start or Update by the tax you applied
