Consider the english sentence: “You should change your password frequently” (or “One should change one's password frequently.”)
What word would be used to translate your above? I know that man would be used to translate you, but I don't know what the possessive form of man would be.
Can you repeat man but add an -s to make it possessive? (e.g., „Man soll häufig mans Kennwort ändern.“) Or is there some other word that can be used instead?