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Pedja,
The image is defined by the Open Graph Image tag that JFBConnect should try to set automatically. If it's for a Joomla content article, please make sure the Open Graph - Content plugin is enabled. If you're using other extensions that have an Open Graph plugin installed, enable those as well.

Once enabled, the plugin will pick the best image on the page, like the first image in an article or the image set in the parameters as the Full Text Image. Alternatively, on any page, you can add the tag below to specify a specific image to use for that page:
To test, you can use the Facebook URL debug tool to test individual pages and see what Facebook 'sees' on your page.

I hope that helps,
Alex

Awesome! Glad to hear that helped and I hope that helped give some more information about how things work. As always though, should you need anything else, just let us know.

Finally, if you haven't already, please consider leaving a rating and review for JFBConnect, or our support, on the Joomla Extension Directory. It certainly isn't required, but is very appreciated:
extensions.joomla.org/extensions/social-...ook-integration/7215

Thanks,
Alex