Find the gas control valve. It could be in a number of places, including behind an access panel, attached to the log set, behind louvers or in a compartment under the firebox floor.
Find the gas supply shutoff. If it is turned off, turn it to the on position.
Find the ignition button and press it. You should hear a click and possibly a hiss.
Turn the gas valve to the pilot position and push the ignition button every 10 seconds until there is a flame, holding it for 30 seconds after the flame is lit.
Turn the gas valve to the on position.
Turn safety valves on.
Turn gas off by pushing in on the knob and turning it clockwise to the off position.
Clear air from the gas line by waiting five minutes after turning the gas off.
Turn the control knob to pilot by turning counterclockwise.
Ignite the lighter, place it over the pilot and push the control knob in completely, and hold. Hold the knob one minute after the pilot is lit.
Release the knob and turn the control knob to the on position by turning the knob counterclockwise.