PASS PULL... Pull the pin. This will break the tamper seal and unlock the fire extinguisher's operating handle.
AIM... Aim low, pointing the extinguisher nozzle (or its horn or hose) at the base of the fire, about 6 to 8 feet away from the fire.
SQUEEZE... Squeeze the handle to release the extinguishing agent.
SWEEP... Sweep from side to side, discharging it's content at the base of the fire.