Hi,
thanks for purchasing this theme.
Unfortunately this isn't possible. Available icons are: CodePen, Digg, Dribbble, Facebook, Flickr, GitHub, Google+, Instagram, Linkedin, Pinterest, RSS Feed (urls with /feed/), Tumblr, Twitter, Vimeo, WordPress, YouTube. Linking to any of these sites will automatically display its icon in your social bar.
All the best,
Ana