A) There are two ways to connect to limb...
Text Book Version: If you have a limb about 6-8 " thick,drill a hole in limb. Insert the Eye-bolt. this becomes anchor point for swivel. Connect with chain-link to swivel hook and chain. (The problem with this method is that you have to be exact with your measurements and adjustment is not easy.)
If you don't have the perfect Limb: Wrap a single strand of chain around tree limb, Make sure you have wrapped the limb with a protective cover, such as a old rubber hose or some other material that will afford some sort of protection, otherwise the chain may dig into the branch. The chain becomes the anchor point for the swivel.Connect the chain to the swivel hook with the adjustable chain-link we supply. This method uses a little more chain, but allows you to adjust the height easily..we highly recommend this method.