How should one advise the one in authority?

Question:
But should the advice be given through rumors, pulpits, and the media, or is there a path prescribed by Allah and His Messenger (peace and blessings be upon him)?

Answer:
No, one does not criticize the rulers in public, openly, standing in a sermon, a lecture, or a gathering, and speaking ill of the rulers. This leads to evil. But if you see a mistake, you contact the one in authority if you are able to reach him and clarify it to him. And if you cannot reach him, you advise those who can contact him, such as his associates or scholars, to convey this matter to the one in authority so that he can address it and return to what is right, because he wants good, and he is a human being who makes mistakes and hits the mark. We cooperate with him.
But in private, not in public. The private matter is between us and him: either we contact him, or we write to him, or we advise those who can contact him. Yes.