Hi cardspink67,
If you were to edit your saved listing, upload the additional image, and click "Post", you would end up with a duplicate listing.
In order to add an image to the bottom of this listing, please go to your Auctiva active listings page, check the box next to the item, and click the "Add Images" button.
If you would like to add the image within the listing template, you can do so via the following process:
1) Locate your listing in your Saved Listings folder, make any necessary changes, and save.
2) Check the box next to your updated listing in your Saved Listings folder and click the “Get html” button.
3) Select All and copy the html in the popup window.
4) Locate the item on eBay and click the "Revise Item" button.
5) Click "Edit Description" then click the "Enter your own html" tab above the description editor.
6) Delete the html that is already there and then paste the copied html in its place and save you changes.
-Mike