How do I add a you Tube Icon to social icons in the header

There’s no youtube icon in the font icon set at the moment – Kriesi will probably add a youtube icon to the icon set in the next update. For now I’d suggest to append the youtube icon as an image to the icon list. In header.php replace

$social_args = array('outside'=>'ul', 'inside'=>'li', 'append' => '');

with

$social_args = array('outside'=>'ul', 'inside'=>'li', 'append' => '<a href="http://youtube.com" class="youtube" target="_blank"><img src="http://mywebsite.com/youtubelogo.png" title="Youtube" alt="Youtube" /></a>');

and instead of http://mywebsite.com/youtubelogo.png insert the url to your youtube icon and replace http://youtube.com with the youtube account url…