Slide the jack stand under the car, just behind the jack.

Slowly lower the jack until the jack stand is supporting the car. Remove the jack.

Many hydraulic jacks are lowered by placing the open end of the handle over a knob and turning it counter-clockwise. Consult your owners manual for your jack if you don't know how to lower it.

Never work underneath a car that is only supported by a jack. The jack may slip or fail, resulting in serious injury or death.