The purpose of this script is to give the user full customization of the share section on their forumotion toolbar. That is ; Remove unwanted buttons, create new buttons, or completely reinvent the area.
To install this manager go to your Administration Panel > Modules > JavaScript codes management and create a new script with the following settings.
Title : Share Button Manager
Placement : In all the pages
Then copy the raw source into the textarea and save. By default, this should enable three new share buttons ; Pinterest, Tumblr, and Reddit. As well as a few extra buttons that are disabled, and some tooltips added to each button.
For a more indepth tutorial please see one of the links below.