Step 1: First shake the fire extinguisher, as shown in the following figure:

Step 2: Unplug the lead seal when using it, as shown in the following figure:

Step 3, then pull out the safety pin, as shown in the following figure:

Step 4: At last, the distance from the fire source is about 2-3 meters. Hold the bottle with your left hand, and press the switch with your right hand to spray out the dry powder to extinguish the fire, as shown in the following figure: