This is a way to sharpen the blade while it is on the saw. YOU HAVE TO UNPLUG THE MACHINE THAT YOU ARE SHARPENING THE BLADE ON BEFORE SHARPENING THE BLADE! IF YOU GO WITH THIS METHOD, IT IS AT YOUR OWN RISK!
Either way, it is a great means to sharpen your blades quickly. You just need some sharpening sticks, and once you find the correct placement of the stick to the tip, then you just go back and forth a few times. You will feel when you are at the right point to start.
Again, this is at your own risk. You must unplug the machine or saw before starting or an accident can happen!