529 plan on CO income tax forms. where do I enter on the CO return?

I am also looking for a slot to report my College Invest  contributions on the Colorado income tax forms.  When I printed out the CO "Subtractions from Income Schedule" form, it was under the "Subtractions from Federal Taxable Income" column.  That shouldn't be an income source.  It's a deduction on State forms only.  I wanted to amend my 2019 Taxes to include the College Invest amount but I was stimied on the amending procedure.  Please clarify.