How to install WPSSO Social Sharing Buttons - Facebook G+ LinkedIn Pinterest Reddit Twitter + Many More plugin:
Go to Wordpress admin area and click "Plugins" and then "Add New" menu item.
In the right panel (left top) you will see "Upload Plugin" button. Click the button.
Next click the "Choose file" button in right panel (center).
Select zip file of the "WPSSO Social Sharing Buttons - Facebook G+ LinkedIn Pinterest Reddit Twitter + Many More" plugin located on your hard drive and press "Open".
Click "Install Now" and the zip file will upload to your site.
Now click "Activate" button to activate the "WPSSO Social Sharing Buttons - Facebook G+ LinkedIn Pinterest Reddit Twitter + Many More" plugin.
We've tested following plugins published by: Jean-Sebastien Morisset