Those are the most unspecific directions I've ever heard for baking a potato.
OK, how about this:
1. Select your potato and give it a good scrubbing, preferably with a brush, but with your hands is fine so long as you're thorough.
2. Poke it several times with a fork, all around the potato. This is to let the steam out so that the potato gets nice and fluffy inside.
3. Smear it with a little bit of cooking oil - olive, canola, corn, doesn't matter so long as it's edible. This will give you a slightly crispy skin, and it also conducts heat into the potato a little more quickly.
4. Put it in a pan or on a baking sheet. If desired, sprinkle it with some salt or garlic salt.
5. Put it in a 350-400 degree oven.
6. Bake for, oh...an hour or so. The bigger the potato, the longer it will take. Regular-size potatoes only take about 45 minutes in my oven, but I have a convection oven. A great big potato in a conventional oven might take 1:15 or so.
7. If you can squeeze it with your (dish towel or potholder protected) hand and it feels nice and soft inside, it's done.
Do not wrap it in foil - it'll turn out gummy.
Too specific?