Hi sales13,
For adding social media profile url you can go to Kensington options–>social
http://prntscr.com/m6t6aa

But currently we don’t have youtube and linkedin social media. We will add this in the next update.

Regards

The simplest way to add more social media icons to your site involves accessing the Theme Options panel, enabling the options for Facebook, Twitter, Google+, and RSS, then entering your profile URLs into the fields. When you do this, you’ll see them show up as icon links in the footer of your site

We need a youtube button asap

Great but how does one update the theme ?