I’m having the same issue now.. can’t find where to add this information for 2019 for Indiana. Anyone had any luck? Help please!!!!
Please see the answer just above your question for step by step details.
The input section for the Indiana 529 plan contributions is on the 'Take a look at Indiana credits and taxes' page.
Scroll down to the Education section and click Start or Update beside Indiana CollegeChoice 529 Plan to enter your information.