Most of our full-size gas grills come with a little chain that has a small metal stick attached to the end of it.
This chain/stick is called the match-stick holder, and it can be used to manually light the grill if there's a problem with the electronic ignition system.
The image below depicts how the match-stick holder is used on most models, but please refer to the owner's manual for your specific model before attempting to manually light your grill.