Question
how do I adjust the distance on the ProStream Lawn Sprinkler?  

Answer
There should be a small screw on the top of the sprinkler, right above the nozzle that will reduce the distance if screwed down (to the right).  It may be somewhat concealed by the rubber cover, but there is a slot in the rubber that you can put in a tool to adjust the screw.  Im not sure whether or not it takes a small Allen wrench, or a small slotted screwdriver.  If you have a little tool that came with the sprinklers, that should do the trick.