Lift the car high enough so that you can place a jack stand beside the jack. Slide the stand under the car, making sure that the top of the stand will connect to a solid portion of the car's frame when the car is lowered.

Slowly lower the jack so that the car is resting on the jack stand. 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.