OPTINAL: soak your oat groats with 1 teaspoon of water per cup of groats in a ziploc or airtight container overnight. Make sure the groats aren't noticeably wet before putting them into your flaker--they should be just very slightly damp.
Pour your oat groats into your oat flaker, making sure you don't overfill the hopper or it can jam if it's too full.
Place a bowl under where the oats will come out, turn the flaker on, and wait for the magic of freshly rolled oats.
Use your freshly rolled oats in any way you'd normally use oats--granola, oatmeal, in cookies or breads.