Turn off the electrical power to the range at the circuit breaker.
Move the stove away from the wall and turn the gas supply valve to "Off."
Pull the bottom drawer out, lift up to dislodge it and remove the drawer from the appliance.
Locate the pressure regulator, which is the cylinder knob at the bottom right side the stove, and lift off its dust protector.
Insert a slotted screwdriver into the crevice behind the gas pressure regulator cap and press down to release it.
Flip the cap over to convert the gas. Place the hollow end of the cap back onto the regulator if you want to use natural gas. Place the solid end of the cap onto the regulator if you want to use propane gas.
Push down on the cap with your hand, then tighten it with an adjustable wrench.
Slide the bottom drawer back into the stove. Turn the gas supply valve to "On" and turn the electricity back on at the breaker box.