I set up the FaceBook Plug in. 

Fisrt en the head page i insert this code:

<div class="fb-login-button" data-show-faces="false" data-width="20" data-max-rows="0"></div>

But, the botton appears in the top left corner.

And in the right top corner, appears the default log in buttons, doesn´t show the facebook button.

And when you press this button, the next window or box doesn´t show the facebook button.

::::::::::::::::::::::

Then tryied whit this code:

<fb:login-buttonregistration-url="https://developers.facebook.com/docs/plugins/registration" />

But crash my site.

www.mejico.mx/red