You can turn your gas off at the main shut-off valve on the inlet pipe next to your gas meter.
Using a wrench or other suitable tool, give the valve a quarter turn in either direction so that it is crosswise to the pipe (see diagram).
Find a natural gas contractor.
Caution! Once the gas is shut off at the meter, DON'T try to turn it back on. Only a registered gas contractor can turn the gas on safely. Call FortisBC, or the British Columbia Safety Authority to find a licensed gas fitter to restore gas service.