How to turn on gas fireplace. Turn the control knob to the off position for at least 5 minutes. It should also be out of the main traffic area in the home. Wall switch to turn on gas fireplace if you turn off the main breaker to your house and you can still turn on the fireplace then its a millivolt system where the pilot light heats a thermocouple that generates a few thosandths of a volt.
If you dont see the valve it is probably behind the fireplace. Then let your fireplace sit for at least 5 minutes allowing any excess or lingering gas to clear out. Now turn the gas back on with the gas key and hold a long match or fireplace lighter there.
If the knob is not in the off position turn it so that it is. Look for a knob on your control panel with the words on off and pilot on it. Like any fireplace the surface of the gas fireplace gets hot so you should plan its placement away from curtains or furniture.