Remember the word P.A.S.S.
P - Pull the pin without squeezing the handles together.
A - Aim at the base of the flames from a distance of 10-12 feet.
S - Squeeze the handles together; do not release until fire is completely extinguished.
S - Sweep from edge to edge of the area on fire. Always keep your back to an exit to avoid being trapped.
In the event the fire cannot be extinguished, evacuate the area. Follow evacuation procedures.
Monitor the area until emergency personnel arrive.