Always operate extinguisher in upright postion. As shown in figure, the acronym to remember when operating a portable extinguisher is P.A.S.S.

Pull…Aim…Squeeze…Sweep…

Underwriters Laboratories (UL) classifies and rates fire extinguishers on their ability to put out various types and sizes of fires. Check your fire extinguisher label before use to be sure you are using the appropriate type of extinguisher on a fire.