When adding my 1099G for overpayment from 2018, I chose that I had filed with the standard deduction. I actually itemized. How do I change this on my 2019 return?

[MarilynG1]

Type '1099-g' in the Search area, then click on 'Jump to 1099-g'.

Continue to 'Lets's See if Your XXX Refund is Taxable'. 

Indicate 'I itemized deductions in 2018' (screenshot). 

Click this link for detailed info on How to Enter 1099-G.

[geimanjm]

unfortunately, I cannot find where to change this on the turbo tax website. Do you have any suggestions without doing it through the desktop application?

[MarilynG1]

The same Search terms and screens will apply in TurboTax Online.

The screens may look a bit different, but will have the same info. 

Continue through several screens after entering amount of refund before reaching this screen (screenshot).

[geimanjm]

I managed to fix it by deleting some of the worksheets, so turbo tax would prompt me to re-enter the additional data.