To manage all aspects of your account, which includes creating and removing new users, changing passwords and more, sign in to the master account simply go to https://mail.domain.com where domain.com is your company or organizations domain name. Type this into the address field in any Web browser, such as Internet Explorer or Firefox.
Examples:
This will load your inbox where you can compose new e-mails, create labels and filters to make your e-mail more manageable.