In the Power Store Content Management section, select the home Page content group and edit the Contents content area.
the boxes image also apears in the featured product and popular product pods.
When adding products, there is a button that you can select to set an item as the featured item, changing the featured item will change the image that is used for the featured pod.
the popular pod is based on product sales, the image displayed in the popular pod will change when an item is purchased.