How to place social icon in Socket ?

Hello
I try to add those lines in footer.php:
<ul class='noLightbox social_bookmarks icon_count_3'><li class='social_bookmarks_twitter social_icon_1'><a target='_blank' href='#' aria-hidden='true' data-av_icon='' data-av_iconfont='entypo-fontello' title='Twitter'></a></li><li class='social_bookmarks_gplus social_icon_2'><a target='_blank' href='#' aria-hidden='true' data-av_icon='' data-av_iconfont='entypo-fontello' title='Gplus'></a></li><li class='social_bookmarks_rss social_icon_3'><a href='#' aria-hidden='true' data-av_icon='' data-av_iconfont='entypo-fontello' title='Rss'></a></li></ul>

> The icons are not visible, i just see the background color change on rollover…

I see that someone else has done it, but i do not know how :
https://kriesi.at/support/topic/place-social-media-icons-into-a-widget/
http://www.brixenivy.com/

Thanks