Firstly, find the dial on your heater and turn it to Pilot. Then, press on the Pilot gas button for about 30 seconds and then release it. Secondly, press on the Pilot gas button again to ignite the Pilot. If your wall heater is new, it will ignite the Pilot light. In the case of the old burner, you should do it manually with a lighter or a match stick. When the pilot light starts, press the gas button for a minute and release it. Finally, start the main burner by turning the dial toward On.