Wrong position of JFBC buttons on Joomla login form

On my Joomla login page, JFBConnect has automatically inserted a JFBC section in login form:
www.koechlin.net/index.php?option=com_users&view=login&lang=fr

My problems are :
1/ it has not the same right margin as the rest of the form
2/ it is on the top of the form, and I would like it to be displayed after the "connexion" button
3/ I have tried to unpublish this JFBC block by setting "Integrate into Joomla Login=none" (within JFBConnect component setting), but the block stll appear.

Do you know how to solve that?

EDIT : I have succeeded in displaying buttons after the "connexion" button (with {JFBCLogin} tag), so my remaining problem is to make disapear the JFBConnect buttons on the top of the form