Stand away from the fire and follow the four-step PASS procedure recommended by the National Fire Protection Association:
P - Pull the pin and hold the extinguisher with the nozzle pointing away from you.
A - Aim low at the base of the fire.
S - Squeeze the lever slowly and evenly to discharge the extinguishing agent. (When the agent first hits the fire, the fire may briefly flare up. This should be expected.)
S - Sweep the nozzle from side to side, moving carefully toward the fire. Keep the extinguisher aimed at the base of the fire.
For your main home protection, install a 2-A:10-B-C rated extinguisher on every level of your home, no more than 40 feet apart. This could include locations such as living areas, garages, and workshops.
The kitchen is the most likely place for a fire. Protect your home with a UL rated fire extinguisher, such as the Kidde Kitchen Fire Extinguisher.