You have to add the social network to the
class.options.php file. Just search for one of the existing one. What you need to add should make sense when you see the others.
You would then need to find an icon that you would like to use and create various sizes of it and place them in the
../wp-content/plugins/connections/images/icons/**sizes**/ folders. The important bit here, is the icon file will have to be named exactly as the lowercase key name you used in the
class.options.php file with a
.png file extension.
Hope that helps.