Error after login

Gregory,
Your English is fine

To add the Login with Facebook button to that location, you'll need to modify the JomSocial frontpage.guests.php template file and add {JFBCLogin} wherever you want the button to be. For more information on how to do that, see:
www.sourcecoast.com/jfbconnect/docs/thir...ration-for-jomsocial

For the warning you're seeing, it's happening because you either haven't hit "Apply" when in the Profile tab, or you aren't doing any field mappings. It's a warning we'll need to fix, but shouldn't cause any problems. We'd recommend you turn Error Reporting to "None" in the Joomla Global Configuration area.

Hope that helps, but if you need anything else, just let us know,
Alex

Gregory,
Glad we could help!

After you've played with JFBConnect a bit, please consider leaving a rating and review on the Joomla Extension Directory:
extensions.joomla.org/extensions/social-...ook-integration/7215

Thanks, and good luck to you and your site!
Alex