Are you trying to e-file them?

Check the box for Amending federal return.

In the next entry click the input area for 1=amending state return and put a 1 in each box along with the drop down for the state to amend. 

don't get that screen for the 2018 return year.

You didn't say you were using 2018.

Are you using Pro Connect Tax software?

I am using ProConnect Tax.

See image > mouse over the box to the the + > Click the + to get that screen from above