Help Center
Social media settings
Navigate to Appearance → Customize → General → Social Media to see the options.
Share Icons
On the first section select the share icons you want to show on the posts and products pages. Enable the buttons you want to show and change their sort order.
Social Media Links
Add all the icons you want to show on your Header or Footer (visit each section to enable the social icons).
Add a new item, choose the Social Network and add the link.