1. In the JFBConnect backend > User Map area, you should be able to delete the user mapping of the social network credentials to the Joomla account. If you delete this, the corresponding Joomla account will still remain. If you need to delete the regular Joomla user, you can do that through the normal Joomla users manager.
2. Depending on your configuration settings for JFBConnect, you should be able to log out even though you've used FB credentials to log in. You may want to look into the JFBConnect backend > Configuration > Facebook area for the "Auto Login Facebook Users" setting if you cannot log out, or if the logout button is not showing in the SCLogin module, there's a setting in the "Logout View Settings" tab called 'Show Logout Button'.
-Melissa
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