Start in a Pike stand position, with your feet on an elevated surface, your hands on the ground, and your hips placed vertically over your shoulders and hands.
Slowly shift the weight forward towards your hands, so that your feet can come off the support.
Hinge at the hips to bring your legs up and stack them vertically to reach a Handstand position.
Be careful not to let your legs drop on the box.
Form tips
A common mistake is to allow the shoulders to close (= reducing the angle at the shoulders and leaning more forward). This makes the exercise, which is already difficult to start with, much harder from a strength perspective (and more similar to a Planche ). So focus on keeping the shoulders as open as possible, to keep your hips, shoulders and hands stacked vertically.