What you do is turn the ign but not the car on. Make sure your bottle valve is closed and no nitrous in the lines. Flip the arming switch on, then go to the box and hit the button. The box will then blink from green to red. Then go to the car and press the gas pedal to the floor for ten seconds. After that then go back to the box and i believe it should be blinking green after that. Then turn the arming switch off then back on, then press the gas pedal to the floor and you should hear the selenoid switch on at that point. If you hear it clicking when the pedal is at WOT with the arming switch on then your done and ready to go out and spray.