How to Add New Social Link to Post Social Sharing Buttons - Zemez
To add new social link and sharing button to the existing ones you need to apply changes in “template-tags.php” file. To access it open your cPanel.
Locate wp-content/theme_name/inc directory and open template-meta.php ... ' share_url' => 'https://www.facebook.com/sharer/sharer.php?u=%3$s&t=%4$s',. ),.