Instagram Error

Hello,

There was no instagram icon available on the button list but I was able to add it to the finishing code. It displays alright to the admin page but when viewed in the front end, the added instagram icon cannot be found :/

Admin area
http://awesomescreenshot.com/08940dg104

How can it be viewed?

https://ww.wp.xz.cn/plugins/share-this/