In the Admin toolbar, click on the Menu button, then click Structure.
Click on the Social Links Menu (very right bottom)
By default, four social media sprites are available to you within your template site if you enable them. Click the Enable button and add the URL to your specific Facebook, Google+, Twitter and/or YouTube for your organization.
You can reorder the social media sprites by dragging and dropping them to your preferred order.
To add another social media sprite, click the + Add link button.
Complete the two required fields. The Menu link title should be the name of the social media site. The Path should be the URL to your own specific page for your organization.
For each link that you add, specify the class name in the Classes field, in all lowercase. The class is needed in order to make the appropriate icon appear. Note: If you accidentally adds an extra space after the name, it causes the icon to overlap the text.
Click the Save button at the bottom of the page.
Once added, you can go back to the social media sprites and uncheck them to disable the menu link, or edit to change the URLs to which they point.
Use the following class names for the social media icons to appear (all lowercase)
Remember! Your changes will not be saved until you click the Save button at the bottom of the page.