Log on to your control panel at this address:
http://cp.mydomain.tld <-- replace mydomain.tld with your domain name
From the Main Menu, Click the 'My Domains' icon
This will show you a list of all the domains in your control.
Click on the domain name where you want to add SmarterStats
From the Edit Domain screen, Click the 'SmarterStats Web Statistics' icon:
The next screen tells you that SmarterStats is not currently enabled,
Click the Enable Statistics button:
Provide the required information and click Save in top left corner.
NOTE:IMPORTANT: Your Primary Username MUST be your domain name (without the .tld)
(see image)
SmarterStats is now enabled on your site.