Nexgrill 720-0018-LP - Manual (Page 15)

ASSEMBLY INSTRUCTIONS
— If you’ve just attempted to light the burner with the igniter, allow 5 minutes
for any accumulated gas to dissipate. Keep your face and hands as far away
from the grill as possible. Insert a lit extended match (using the chain &
match holder shown in the figure) or lighter through the cooking grids to
the burner. Press the control knob and rotate left to the HI setting, continue
to press the knob until the burner ignites. Burner should light immediately.
If the burner does not light in 4 seconds turn the knob off, wait 5 minutes
and try again.