Hi Ritz,
To use a gallery photo when creating your listings through Auctiva, you must select the image you'd like to use as your galler image from the "Select an Image" box labeled "Gallery" in the "Image Selection" section of the lister page, as well as check the box next to "Gallery" in the "Marketing Tools" section.
If you would like to add a gallery image to your listing that is already active, you can do so via the following process:
1) Log into your eBay account and click on "My eBay"
2) Click on the item for which you'd like to change the gallery image.
3) Right click on the image you'd like to make your gallery image and click "Properties"
4) Copy the image URL...it begins with "http://..."
5) Click "Revise Your Item"
6) Click "Edit pictures & details"
7) In the "Gallery Image URL” field, paste the copied URL over the existing one and save your changes.
-Mike