Mambo Banner Component
Mambo allows you easily to remove or change the banner ads that are part of the default installation. You can also add and manage new ones. That can be done through the Components menu -> Banners tab -> Manage banners.
In the banners list check the boxes in front of the two default banners and then click the Unpublish or the Delete icon at the top right...
To add new banners click on the New icon.
You can also add and remove separate clients from the Manage clients tab, just below the Manage banners one.