How do you adjust rear shocks on 2001 kawasaki vulcan 500 en-500c 500 ltd?

On the shocks themselves you will notice a hole for one of your tools in your tool kit. If you don't have the tool kit, just look at the shock and you will see, towards the bottom of the shock, just beneath the spring, a hole. This "Hole" also fits into one of a number of grooves on the shock itself, 1-5. By changing what groove that "hole" is in, you can make the shocks harder or softer. 5 is hardest, 1 is softest. If they aren't numbered, the groove that lets that "hole" get closest to the spring is 1, and the one that keeps it the furthest away is 5.