Squeeze the top handle or lever. This depresses a button that releases the pressurized extinguishing agent in the extinguisher. Sweep from side to side until the fire is completely out. Start using the extinguisher from a safe distance away, then move forward. Once the fire is out, keep an eye on the area in case it re-ignites.
Theory is great, but there is no substitute for hands-on experience.
To complete the Fire Extinguisher Training Module, please take the Quiz .