How do you enter amount for illinois schedule m which is a subtraction for military pay?

Please make sure that you checked the active-duty military box for the W-2 on the "Do any of these uncommon situations apply to this W-2?" screen right after you enter your W-2.

 

1. Click on "Search" on the top right and type “W-2”
2. Click on “Jump to W-2”

 

Then when you go through the state return interview double-check that your military pay is entered correctly on the "Military Pay Exclusion" screen for Illinois.