To add new banners go to the Modules and Services-> Modules and Services tab, then find the "AT - Banners" and click the "Configure" button.
On the next sub page, move the page down until you see the banners. To remove the old banners click on the arrow at the edit buton and select "Delete item".
To add a new banner click on the "Add item" button.
In the "Hook" field, select the place where you want to add a banner.
In the "Image" field, select the banner you want to add. When you are finished click on "Save".
Other fields are optional.
The screens below are marked for places where you can add banners.