Hi Len,
Once you have added the BBB image to the description editor using the "Insert an Auctiva Hosted Image" button on the description editor toolbar, you can turn that image into a link by selecting the image with your cursor and clicking the "Insert/Edit Link" button on the editor toolbar. This button has an icon of a globe and chain link on it.
When you click the "Insert/Edit Link" button, just enter the URL you would like the image to link to in the "URL" field on the ensuing pop-up window and click the "OK" button and your image will have been converted into a link.
If you have any additional questions or concerns, please feel free to contact our customer support team by completing the web form on the following page of our site:
http://www.auctiva.com/help/requesthelp.aspx
-Mike