@omaradnan2, you have a few options.
Facebook, Flickr, Twitter, LinkedIn and YouTube are currently the only social profiles that are included with the theme. If your icon was the same size as the existing, a single linked icon image could be put into a text widget and moved up beside the existing icons.
You could also create your own social icons linked to your profiles in a text widget and then we could help move that text widget up into that location using CSS to replace the existing built-in social profile feature and style things accordingly.
Text Widget Links
WordPress.com also has an Instagram Widget you can put into your sidebar that will show your latest Instagram photos.