Stratch out the rubber bands behind th wheel and let them glide towards the outside over the piece of the snow chain whitch lies open.
Fasten the inner cable.
Fasten the snow chain first and then the cable belonging to the compact tightening device.
Lift up the tightening device (you need to move the car e little bit) and use the 4mm key (it comes with the snow chains) to tighten the snow chains well. Then fasten the rubber star (the hooks shounld point towards the outside).
Release the tightening device by pressing the button. Unfasten the snow chains and the cable.