Finally to add in the social icons you need to do one extra step. We've included templates on each block where you can utilize more XenForo functions than just style properties. Each block is titled: xb_footer_Block1Helper
In this case our icons will be going into block 1, so open xb_footer_Block1Helper
Simply remove the <xen:comment> and </xen:comment> around the include for the social icons.
This is changing slightly in the next Xenbase to make it easier though.