The Admin Control Panel is where you manage your account.  Here you can create mailboxes and view usage statistics for your website.  Using a web browser, go to the following URL and use the specified credentials.

Location: http://your-domain.com/admin
Login: admin
Domain: your-domain.com
Password: <your password>

A screen will come up asking if you want to accept the security certificate, click Yes.  A screen just like the one below will come up asking for a Login and a Password. The control panel itself has a very intuitive interface.  If you need assistance with any of the advanced features, please refer to the online help guide.