There are 23 social icons in this theme. In case you need a new one, just upload a new PNG icon into theme_folder/images/icons folder and refer to its file name. For example if you upload a file named myicon.png, then you can call the following shortcode:
[icon type="myicon"]
[icon type="blogger" link="#"] [icon type="deviantart" link="#"] [icon type="digg" link="#"] [icon type="dribbble" link="#"] [icon type="email" link="#"] [icon type="envato" link="#"] [icon type="facebook" link="#"] [icon type="flickr" link="#"] [icon type="forrst" link="#"] [icon type="github" link="#"] [icon type="google+" link="#"] [icon type="instagram" link="#"] [icon type="linkedin" link="#"] [icon type="picasa" link="#"] [icon type="pinterest" link="#"] [icon type="rss" link="#"] [icon type="skype" link="#"] [icon type="soundcloud" link="#"] [icon type="tumblr" link="#"] [icon type="twitter" link="#"] [icon type="vimeo" link="#"] [icon type="wordpress" link="#"] [icon type="youtube" link="#"]
Alternatively you can also use an external image by pasting its URL into image attribute, like this:
[icon image="http://yoursite.com/myicon.png"]