You also need two lengths of chain with hooks, plus tree strop, length of chain and recovery rope. Oh and a couple of shackles!
Basically you remove the foot of the jack and attach the adapter. Attach recovery rope to stuck vehicle, attach chain via tree strop to to tree and then to bottom of jack. The top end of the jack then connects to the rope/strap attached to the vehicle. The two lengths of chain with hooks are used to take the strain alternately whilst you winch.
It can get you out of trouble, but is a total PITA. The genuine Hi Lift is better quality and at least comes with the two lengths of chain with hooks, a quick release pin and instructions!
An alternative is to wait for another 4x4 to arrive or even walk a few miles to a road to try and flag one down - a lot less effort than trying to winch on a jack!!