Your Gaia password should always be kept private. If somebody gets your password, they can do all sorts of bad things: they can lock you out of your account, steal your items, change your profile, pretend to be you, and cause lots of trouble. You should never give your password to anyone except your parents. Even giving your password to friends is a very bad idea! Gaia moderators and administrators will never ask you for your password by e-mail, by PM, or by any other means.