Ok ... you are confused ... those 2 items do NOT get entered in the same place.
First the 2016 refund received in 2018 ... If you itemized deductions it is entered in the 1099-G in the income section of the 2018 return which I think you already did.
Now for the 2017 return filed in 2019 for which the refund was applied to the 2018 return ... that is considered a 2018 estimated payment ...
Go to the Federal Taxes tab (Personal tab in TurboTax Home and Business).
Click on Deductions and Credits.
Click on Jump to full list.
Scroll down until you see the Estimates and Other Taxes Paid section and click Show More.
Find Other Income Taxes and click Start/Revisit.
2017 Refund Applied to 2018 and choose Start/Revisit to appropriate section.
