First, consult the manual with your gas grill to determine how to properly set up, use, and maintain your gas grill. Most models require you to feed gas through a tube to the burners by twisting a coupling that connects your fuel source to the grill, then turning on one of the gas grill's burner knobs. Some options have a dedicated electric ignition button that requires a battery so if you can't get your grill to start, that's a good thing to check.