You can display ads on your website by customizing your pages with one of the advertising widgets available to you.
The Manage Ads page allows you to enable or disable the ads for the Web site. If you want ads to be displayed on the site but want to restrict certain users from seeing them, you can grant the Site - Hide Ads permission to the user role. (You cannot ungrant the Site - Hide Ads permission to the Administrator role.)
To enable ads: