Instagram was not active when this theme was released.
You need to modify the code a little bit to add a new social icon.
To add a new social icon in the social shortcode –
First modify the image email@example.com and replace the original file in the images folder with the new one.Then you need to modify the file framework/shortcodes/social-shortcodes.php
To add a new social icon in the social network-widget-
1.Modify the image firstname.lastname@example.org and replace the original file in the images folder with the new one.
2.Pls modify file framework/widgets/mo-social-networks-widget.php.