Before attempting to fight a small fire be sure everyone is out of the building. It is important to have someone call the fire department. The operator must know how to use the extinguisher, quickly without taking time to read directions during an emergency. Remember that the extinguishers need care and must be recharged after every use. Pull the pin.
Some extinguishers require releasing a lock latch, pressing a puncture lever or other motion.
Aim low, pointing the extinguisher nozzle at the base of the fire. Squeeze the handle. This releases the extinguishing agent. Sweep from side to side at the base of the fire until it appears to be out. Watch the fire area in case fire breaks out again, and repeat use of extinguisher if necessary.