Place your feet on the pad and support your knees against the pads.
Drive your knees out as far as your flexibility will allow you to.
You’ll feel a contraction in your abductors (outer thighs) and glutes (bum). If you lean forward, you can enable your glutes to assist the abductor muscles to a greater extent.
TIP: You’ll see folks hammering reps out on this machine, but notice how I like to add a slight PAUSE at the peak of every rep and slow things down; this will give you a much better result from this machine.