Figure out your square footage, then weigh out 2 lb of product for each 1000 square feet. Put that in your hopper, Choose a low setting, then apply in alternating directions until it's all spred. That will give you about 1 lb of nitrogen per 1000 sq ft. A winterizing application is traditionally done after the grass has stopped growing (you have put the mower away for the season) but before the ground freezes (frozen soil). Be sure to water it in right after applying. You might choose to do it right before rain if you have already winterized your irrigation. There are different viewpoints on how fertilizer should be applied in the fall, with some specialists saying the winterization application is not utilized efficiently by the grass.