Follow Me Custom Button Additions

I LOVE the “Follow Me” option Suffusion comes with, but it’s missing a pintrest icon and follow option. I’m trying to add my own image but am receiving this error:

Warning: array_key_exists() expects parameter 2 to be array, null given in /home4/sasteffl/public_html/wp-content/themes/suffusion/widgets/suffusion-subscription.php on line 129

Is there anyway I can add in my own image and subscription coding? I should also specify I’m a complete novice when it comes to coding so any help is much appreciated!