Hi Tallboy,
Thanks for posting your question here. If you just want to have one image in your listing and for the image to be displayed once on the search results page and once more when the eBay listing page is opened, you only need to choose the image from the box labeled "eBay Header Image" in the Auctiva Image Selection section of the Auctiva lister page.
On the other hand, if you would like the image to be displayed in the header image slot in the upper left hand corner of the listing AND in the description when the listing is opened, you would want to select that image from the box labeled "Image 1" in that section of the lister page as well.
I hope this helps. If you need any further assistance with your account, please feel free to contact our customer support team by mousing over the "Help" tab within your account and selecting the "File Support Case" option.
-Mike