So noone at WW knew how to hook up the leash? Probably because they only sell one or two brands.

Ok, so the leash connects to the rear line. One end goes to the chicken loop and the other connects to a rear line which SHOULD be coming through a ring on the leader lines from the bar. That line connects to a second ring, which is where the leash attaches.

----line---O---0=====leash====()

The line passed through a ring on the bar, and then is connected to another ring. That ring acts as a stopper to keep the line from slipping through the 1st ring. The leash attaches to that ring.

In this scenario the chicken loop is the leash... when you pull the quick release the chicken loop stays on the hook, with leash attached to it.

Now, here's the problem. If you unhook, your leash is disconnected from you.

I strongly advise against using that setup, it's a bad design.

Get a leash with two clips and attach one to the line ring (which is going through another ring), and the other end to your harness.

I also recommend moving the ring which the line goes through to a front line... so if you accidentally pull on the leash, the kite does not turn or loop on you...

An even better and safer setup is to add a 5th line and use that as the safety instead.