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From your WordPress dashboard, go to Appearance > Customize.Now, click on the Social Options > Activate Social Links Area section. Check onthe checkbox saying Check to activate social links area. Remember this is required in order to show the social icons in the footer as well as the header top bar areas.Add the social links as required here, in the available social networking sections and if you want to open them on the new tab, you can check the box saying Check to show in new tab.

After you have filled up the required social links for your site from here, you can now click on Save & Publish button to save the changes in your site.