Hi Liz,
I was lost on this to until I found this article (
http://www.andysshotglass.com/articles.html). This led me to buy a laser collimator and to experiment ie twist the knobs and see what happens. I have only had my scope for a little over a month now and I am very much still learning.
There was a down side to this though
Brisbane has had overcast or cloudy nights since I got the device and I have not been able to test my efforts for any great length of time.
Greg