1. Check the gas gauge. Make sure that the gas gauge is reading "Empty" and not just "Low". If the gauge is reading "Low," you may still have enough gas to start the car.
2. Try to start the car. Turn the key in the ignition and try to start the car. If the car cranks but doesn't start, it's likely that you're out of gas.
3. Add gas to the car. If you're sure that you're out of gas, you'll need to add some gas to the car. You can do this by using a gas can or by siphoning gas from another car.
4. Turn the key in the ignition and start the car. Once you've added gas to the car, turn the key in the ignition and try to start the car. The car should start normally.
If you're still having trouble starting your car after you've added gas, you may need to take it to a mechanic. There may be a problem with the car's fuel system that needs to be addressed.