Are you talking about ad-enhanced?
You need to put the x10 hosting ad code on your site first in a place where it can be seen without having to scroll down the page. You can get the code from the Account Panel >>
http://www.x10hosting.com/panel.php.
After putting the code on your site, you need to go to the official support area and make a ticket. A staff member will then review your site to make sure it meets the requirements then change your account.