First comment is about the modified for propane label. The vast majority of gas appliances are set up for natural gas. Propane has about twice the energy of natural gas so the main gas valve AND the igniter both have restrictors in them to allow the use of propane. Otherwise you'd burn the appliance up. As to finding the igniter, follow the gas piping from the discharge of the gas valve. It leads to the burners and the igniter will be in the same location as the burners. Good luck.