I work on an Indian reservation and we are exempt from paying state taxes in new york state. how do i change my form to reflect that?

[DawnC]

Native Americans who work and live on a reservation and are enrolled members of a tribe or nation recognized by the United States or by New York State, can subtract income included in federal AGI and earned on that reservation.  

When you go through the NY state return, on the Enter Any Other Subtractions page, the first item is Native American Income Exclusion.