Here is a short article that shows you how to properly dial in the skimmer AND how long before the skimmer is properly broken in...
http://coralvue.com/support/317511-How-do-you-dial-in-a-protein-skimmer
Be sure that the skimmer is installed correctly and that it is placed in the correct water level. Too much water and the skimmer will constantly overflow and too little water and the skimmer will never collect.