When you have a new module (purchase code) for Stackposts like: LinkedIn, Pinterest etc. 
(See a list of modules for Stackpost in https://goo.gl/DDRsMw

Step-by-step guides to add new seperately module for Stackposts on your web application. Please read the following guide carefully:

  1. Step 1: Go to Module page and Click Install button. 
    Install new module
  2. Step 2: Fill out module's purchase code on new PopUp page and then click Install button. 
    Install new module
  3. Step 3: Finish Installation

    You will see successfully message and new module page on Sidebar after a few seconds, if everything is exactly.