If are changing your password because you cannot remember it, there is a "lost password" button on the login screen. You must be logged out of your account to access it, however.
imageIf you know your current password, it is much easier to change. Simply press the "Account password" button on your account page and fill in the fields.
imageIf you are having trouble resetting your password, send an email to [email protected] with the subject line "Lost password".