| Push it in all the way, put the arm stright out so the foot of the jack is on the ground. Chock the wheels if you can and put the handbrake on, turn the crank to jack it up. The length of the little arm that's in the socket + the very high coeficent of friction on the pavement due to the car's weight prevents it from folding up on you.
Just be sure the wheels are chocked well and the foot of the jack is on like, a thick sheet of HARD ice or anything, (or at least the handbrake is on securely and you don't jack it up too high) since if the car decides to shift (and it will without the handbrake or GOOD chocks) it will twist both the jack arm and the jack mount on the car, and possibly destroy both and cause you injury and *$#8 up your car!
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