extention non istalled. Why?

JFBConnect normally includes a Javascript file into the page (/components/com_jfbconnect/includes/jfbconnect.js). Something in your site configuration, or template specifically, seems to be preventing this file from loading on the page.

If I switch out the template, I can see the jfbconnect.js file in the head section. With your current template, it's not there. That needs to be fixed as well. It seems there are other Javascript errors on your page, which may be related to missing Javascript inclusions.
www.drownedmadonna.com/?template=rhuk_milkyway (example with the jfbconnect.js file on the page)

Let us know if there's more we can do,
Alex

That's the User Creation setting of "Full Joomla User". We'd recommend looking over the configuration guide for JFBConnect for all the different settings, in particular, the User Configuration page:
www.sourcecoast.com/jfbconnect/docs/configuration-guide?start=4

Good luck,
Alex

Take a look at the article below which should guide you through adding the Login button to JomSocial's pages:
www.sourcecoast.com/jfbconnect/docs/thir...ration-for-jomsocial

Hope this all helps, but let us know if you need anything else,
Alex