Can you go to your Joomla Extensions Manager -> Manage area. Then, filter by component and look for:
Community
JomSocial
We've seen odd cases where there are 2 installed, and one of them has a really old version. We think this is a bug with really early versions of JomSocial, if you've been using it for a while. If that doesn't turn up anything, search for "1.4.2" to see if anything comes up with that version... it'd be nice to know what JFBConnect is detecting, even if incorrectly.
when i try to click with facebook the window pops up but just opens and closes.
The cause of that is usually that your Facebook app is still in Sandbox mode. It, alternatively, could be a Javascript/jQuery error. In that case, try enabling the "Include jQuery" setting in JFBConnect and test with that.
On your site, I'm not seeing the login buttons from JFBConnect. We'll gladly test further if you let us know where to look.
Thanks,
Alex