To configure how JFBConnect integrates with JomSocial, please enable the Social Profiles - JomSocial plugin. Then, in the Profiles area, you can setup how the profile data is imported from the user's social networks.
I did notice that under profiles it says "se the tab(s) below to configure how JFBConnect should integrate with other components on your site.No JFBConnect Profile plugins are currently enabled.".
There's quite a few things that could cause this. I'd recommend checking the following:
I am trying it on my test site, and when I click on Facebook connect, I don't get any errors, but it just reloads the page.
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