There is a link on the upper right hand side of the home page that you can click to access the Account Manager.
To log in you must use your management username and password. Typically this is the same as your E-Mail account and password without the domain attached. IE if your E-Mail account is 'user@bpsnetworks.com' then your management username is just 'user'.
If you are unsure of what your management username and password are, use the 'Forgot Password' link on the account management login page to have the information E-Mailed to you.