First, pour the salt into a small dish. Place it in your bedroom. Leave it there for at least 48 hours.
A. Grab a few strands of your own hair and use a lighter to burn them. It doesn't matter if they're not completely burned. Just place them on the same small dish.
B. Take a small piece of paper, write your name and birthday on it, and place it under the small plate.
C. After more than 48 hours, wait until you've finished showering, then use the magic salt to wash your hands. That's all there is to it.