You don't look to have the JFBCSystem plugin enabled, which would explain why the Facebook login button isn't explaining. I'd also check the JLinkedSystem plugin. If already enabled, please make sure you've cleared your Joomla caches to make the updates work properly.
Additionally, looking at your site, your Gavick template integration features are still enabled. You should disable those in the template settings as leaving that enabled will likely cause some conflicts with JFBConnect.
Hope that helps, but if not, let us know.
Thanks,
Alex