From the backend of your Joomla site (administration) select Extensions -> Module Manager -> Joomla Social Comments and Sharing
1. Set Status -> Publish
2. Select Module position for OS Social Comments and Sharing - social share Joomla module
3. Select Menu Assignment
4. Save and Close
Very useful use social share Joomla module for Joomla Articles
1. Create new Module Position, how to do it you can read here
2. Turn on plugin "Content - Load Modules"
3. In Article add tag [loadposition position-77]
NOTE: "position-77" it's position on which should be placed Joomla OS Social Comments and Sharing - Social Share Joomla Plugin