Hello @Genesis !

It will look like:

<div class="sys-auth sys-auth-compact bx_facebook bx-def-margin-sec-right bx-def-margin-sec-bottom bx-def-box-sizing bx-clearfix">

            <a class="bx-btn" href="[ULR of your site]modules/?r=facebook_connect/login_form" title="Вход через Facebook">

                <i class="sys-icon fab facebook-square sys-colored"></i>            </a>

        </div>