I would like to fill the formation like 529 plan contribution for state of Kansas which goes on Schedule S. Schedule S form is not available in the software.

We do support the Sch S.  If you go to the, "Here's the income that KS handles differently" , screen.  You can enter the 529 plan contribution on this topic " learn quest education contributions".

How do I navigate to this? I can't search it and not finding a navigation path to: "Here's the income that KS handles differently" screen.

You will need to go thru the state of KS questions again and find the screen.  This screen will have many topics on it.