Accidentally hit part time resident for second state return. Need to change but program DOES NOT give me option to correct it to non resident! How do I get it changed?

It says “if part time Missouri resident isn’t correct to go back to personal info at start of program and change it”   On state form, it never lets me select another option.  On my primary state and federal form I have full time resident in Illinois. This system is REALLY frustrating me! I cannot delete the forms and start over as I already paid. I tried!