JFBConnect has a special menu item for "Account Settings" that you can use to show a user's connections to social networks as well disconnecting those networks from their account.
To use it, create a new menu item and select "JFBConnect -> Account Settings". Once created, you can link to it from wherever you want, such as a user profile page or navigation area.
As for our site, you're correct, we don't have a link to that page currently. It's something we did have before, but when we upgraded our shopping cart system about a year ago, it seems like we didn't add it back in. I'll add it to our to-do list.
Regarding the SCLogin module, if it's styles or functionality don't work on your site, that's fine. JFBConnect does not require the use of the SCLogin module and we have multiple options to automatically add the login buttons to the normal Joomla login or registration pages as well as our easy tag {JFBCLogin} which can be used to add the login buttons anywhere else.
CSS is always tricky as it's impossible to make work for all templates, though our styles are usually compatible with most. We also have a theme system so you can override the layout or styles as necessary to match your site.
If there are functionality issues though, definitely let us know and we'll gladly investigate and try to help get you going!
Thanks,
Alex