If you mean "How can I give other people ratings on their questions?", you can only rate certain kinds of quesitons. These are questions that the person could not choose what answer to put as best answer, so they ask you to choose. You just pick the one you like. If you want to rate your best answer, you need to go to the closed question (has to be YOURS!) and click "Best Answer" and rate and leave a comment. The rate is how well you think they executed their answer, like 5 stars means "This is PERFECT!!!" and one is "Yeah, you're the only one that answered so you win." The more stars you give a person for best answer, the more points they get.