Retirement tax questions

I did not know that we could deduct my spouses Medicaid waiver income for care of my son.  When I am trying to do an amended return, I do not get the "Let's check for uncommon situations" question after entering my W2s.  I do not see how to enter my spouse's Medicaid waiver deduction.  The W2 came with all the income for the Medicaid waiver income in box 1, so I need to deduct it. I could only enter it in the other income (line8Z)  as a negative number.  How do I get to the uncommon situations tab so it will show in the correct line (8S)?