There are several different ways to add Open Graph tags to your page using JFBConnect:
1. Enable one of our Open Graph plugins, such as 'Open Graph - Content' if you're using Joomla content or 'Open Graph - K2' for K2 items. JFBConnect will then automatically add the image tag. If necessary, you can also create an object for more control on which image is used.
2. Manually add an {SCOpenGraph image=FULL_PATH_TO_IMAGE} tag to your content.
3. Add a default image in the JFBConnect > Open Graph > Configuration > Default setting. JFBConnect will fall back to this image.
For more details on the above, please see our documentation at
www.sourcecoast.com/jfbconnect/docs/open-graph/tags-for-joomla
After adding your images, you will need to re-scrape your pages with Facebook using our site
socialdebug.com or Facebook's Open Graph Debugger at
developers.facebook.com/tools/debug/
This should help you fix the problem, but let us know if you need further clarification.
-Melissa