Step 1: The Machine
You will need to experiment and definitely watch the Potatoes the first couple of times you do this.
Disclaimer: You do this at your own risk, if you burn your house down or kill someone it is your fault, anything could happen blahdy blah blah blah...you get the picture. Oh and you will probably void your warranty.
Step 2: Select a couple of potatoes
Word of caution: I do not prick the skins. I leave them so that the skin puffs slightly and crisps up. This does mean however that they build up steam pressure and could blow up in your face. That said, I have done this plenty of times and I'm only slightly disfigured ;o)
Step 3: Start it up
Step 4: Serve and Eat!
Load them up with your favorite toppings, la Voila!
You can include stuff like garlic or herb butter, cheese, tuna, chicken breast, nachos and corn chips, salads.
Once you are competent at this you can try a sweet potato variation and at the end load it up with whipped butter, sugar and cinnamon.