You can login to your account at: http://www.crazyhostingsa.com/superhost/clientarea.html
Your username is usually the email address you signed up with.
If you forgot your password you can get a new one at this link:
http://www.crazyhostingsa.com/superhost/pwreset.html
Once logged in click the My Invoices Link All your invoices are in there click on the View Invoice to view then there will be a link to download it if you need to.