Unplug the dryer from the electrical outlet.
Lift the cover plate off the bottom of the Kenmore dryer. Loosen the screws that hold the panel over the gas flame. Remove the panel.
Locate the air shutter, which is the little panel next to the gas flame. Use the screwdriver to turn the screw on the air shutter to the right to reduce the airflow, or to the left to increase the airflow to the flame.
Place the panel back on the door and screw it in place. Place the cover plate back on the dryer.