The predefined password assigned to the Administrator user account is "manage."

When assigning a password, make it something that is difficult to guess. For example, make it a mixture of upper- and lowercase letters, numbers, and special characters. Passwords cannot be null values or empty strings. Do not use a name, a phone number, your license plate, your social security number, or other generally available information. Do not write passwords down. Do not tell anyone the password unless you are sure of that person's identity.

For instructions on changing a password, see Adding an Administrator User.