Ride with your left hand in front of you if you want to slide with your left foot first or vice versa.
Be patient and make sure to pop just at the end of the jump.
While using counter rotation to twist your skis keep focusing on pointing your chest straight towards the landing all the way over the box.
You can have you front ski slightly edged while the back ski ski is flat against the box. Pop of and twist your skis back to straight again.