TL;DR: If the fire is bigger than a bin, evacuate. Otherwise: Pull, Aim, Squeeze, Sweep.
Choose the Right Extinguisher
Class B/C for fuel/electrical fires. Check pressure gauge, pin, and hose for damage before use.
PASS in 20 Seconds
Pull the pin. Aim at the base. Squeeze handles. Sweep side-to-side.
When to Stop
If flames increase or smoke overwhelms, back away and evacuate. Call supervisor and emergency services.