Compel powder is extremely useful to compel people to do what you want. You can use it by sprinkling it onto a letter you will be sending, by putting some on your hands, then shaking the person’s hand while telling the what you would like the to do, or to rub some onto your resume, and so forth. Though it doesn’t work very well if you just sprinkle some onto the person without making some physical contact and stating what it is you want them to do. For example, just sprinkling it where they will be sitting while you are not around won’t work. Sprinkling it onto a letter then not stating in the letter what you want the to do, will not direct it enough. If you are with them in person, and sprinkle a little where thy will be sitting or into their food can work as long as when they make contact with it, you clearly state what you want them to do.
A word of warning though is if you use it to often on someone it can lead to problems such as them coming to dislike you, or perhaps even hate you if you really overdo it. Also keep in mind if someone gets to them before you do after the compel powder has been used, than that can also direct them more towards what the other person wants and states than what you do later on!