The movements are basically the same as with an SZ-bar, but you use the bar on the multi press:

Stand straight, your feet are shoulder-width apart. Hold the bar with an overhand grip on your thighs, the arms are stretched. Lift the bar close to the body till your chin. The elbows point out so that at the highest point they form a V. Make here a short pause before going slowly down and repeating the movement.

The diagram shows the most used muscles on this exercise