Question
How do I adjust the above Sprinkler Head. I am using this in an indoor arena and would like to not spray the walls.  Thanks   Kurt

Answer
I can't tell from your description which exact type of sprinkler you are referring to, but try the link below which will take you to the Orbit Sprinkler Manual site, where you can find instructions.  

http://www.orbitonline.com/support/guides/Manualsearch3.cfm?Brand=02&Type=Sprink...