Dear Sheeko,
Please go to Module Manager, open Get Socials module:
<ul class="social">
<li><a title="Twitter" target="_blank" href="your_link" class="twit"><span>Twitter</span></a></li>
<li><a title="Facebook" target="_blank" href="your_link" class="face"><span>Facebook</span></a></li>
<li><a title="Flickr" target="_blank" href="your_link" class="fk"><span>Flickr</span></a></li>
<li><a title="Rss" target="_blank" href="https://twitter.com/#!/smartaddons" class="rss"><span>Rss</span></a></li>
<li><a title="Google Plus" target="_blank" href="your_link" class="gplus"><span>Google Plus</span></a></li>
</ul>
=>
<ul class="social">
<li><a title="Twitter" target="_blank" href="your_link" class="twit"><span>Twitter</span></a></li>
<li><a title="Facebook" target="_blank" href="your_link" class="face"><span>Facebook</span></a></li>
<li><a title="Flickr" target="_blank" href="your_link" class="fk"><span>Flickr</span></a></li>
<li><a title="Rss" target="_blank" href="https://twitter.com/#!/smartaddons" class="rss"><span>Rss</span></a></li>
<li><a title="Google Plus" target="_blank" href="your_link" class="gplus"><span>Google Plus</span></a></li>
<li><a title="Youtube" target="_blank" href="your_link" class="youtube"><span>Youtube</span></a></li>
</ul>
Then, please go to yoursite/templates/sj_joomla3/css/ template.css add css:
First your have to open file yoursite/templates/sj_joomla3/images/social-ico.png and add 2 youtube icon (like others) at bottom of the image , then add css:
ul.social li a.youtube span
{
background: left -310px; //you can adjust property to display right.
}
Thanks