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Check your React theme settings first for options to change the social buttons , should be: http://owlish.myshopify.com/admin/themes/7641189/settings
otherwise try: http://owlish.myshopify.com/admin/themes -> Published Theme -> Theme Settings
There is also the option of replacing them with an app, or a 3rd party social buttons service like addthis in liquid
Otherwise see attached image