You can see the likely insertion point in the diagram above (1). Once you've attached something to bind the string to the camera, thread the string around the binding and loop it around your feet as shown above (2). If you've got the length right, you should be able to pull up lightly on the camera to produce tension in the strings. Widen your stance to steady the camera even more. It's even possible to toddle about in this position, snapping passers-by and making penguin noises.
Penguin falls down resulting in best sound ever. It sounds like all his little penguin friends yell because they're really concerned and then he makes an angry sound. I seriously laughed so hard. Had to watch it multiple times!