P - ull the pin. This is a locking mechanism and will allow you to depress the operating lever after it is removed.
A - im low. Always aim the nozzle of the extinguisher at the base of the fire.
S - queeze the lever above the handle. This will discharge the extinguisher.
S - weep from side to side. Move in carefully until the flames appear to be out. If re-ignition occurs repeat the process over until flames are completely out.