Hi, Dennis. If you will look down on the board, you will find that this question has been answered numerous time, but the basics are simple. On a power miter saw, place the crown molding up-side down, as though the deck of the saw was the ceiling. Clamp a block along the front edge of the deck to hold the molding at the correct angle, probably 33 to 43 degrees, so the inner top of the molding is flat to the deck and the inner bottom is flat to the fence. Don't forget that, while outside corners can be mitered, inside corners should be coped. You will get a better fit on inside corners if you back cut your cope about 5 degrees.