If you need to jumpstart your dead battery yourself, you will need two things: another person, a second car, and a set of jumper cables. Attach the red cable clamps to the positive terminals on each car (dead battery first). Then, attach one end of the black cable to the negative terminal on the live battery, then the other end to an unpainted piece of stationary metal on the dead car, such as a bolt on the engine, not the battery. Then, start the car with the live battery, and give it some time to properly charge the dead one.