1. First, to get the image and description tags for your articles, you will need to enable one of our Open Graph plugins (Open Graph - Content, Open Graph - K2, etc - whichever one is appropriate for your page). If you want to be able to customize the article/image, you will then need to set up an Object in the JFBConnect > Open Graph > Objects area.
2. Next, to get the separate image and description for your homepage, I would suggest one of the two options:
A. Add SCOpenGraph easy-tags to just your home page, using {SCOpenGraph image=FULL_PATH_TO_IMAGE} and {SCOpenGraph description=Home Page Description}
B. Adding Defaults to the JFBConnect > Open Graph > Configuration setting. For articles with a description/image already, JFBConnect should ignore this value. Multiple image tags can be added to a page and any images already inserted by an article *should* be added first and given priority.
Try both of these steps and let me know if you still have any problems.
-Melissa