To push start a car with a bad clutch interlock switch, follow these steps:
1. Put the car in second gear.
2. Turn the key to the "on" position.
3. Have someone push the car while you hold the key in the "on" position.
4. Once the car is moving, release the key and press the clutch pedal all the way down.
5. The engine should start.
Be careful when push starting a car with a bad clutch interlock switch, as it is more dangerous than starting the car normally. Make sure that the car is in a safe location and that there are no obstacles in the way. Also, be sure to hold the clutch pedal all the way down until the engine starts, as this will help to prevent the car from lurching forward.
If you are unable to push start the car, you will need to have the clutch interlock switch replaced by a qualified mechanic.