amarjit Hello
The layout of this template is a bit special, that social section is declared via the layout file:
ROOT/templates/gk_appetit/layouts/default.php
Look for this snippet of code:
<div class="gkSocial" id="gkSocial">
<span class="fa fa-share-alt"></span>
<div class="gkSocialWrap">
<a href="#" class="menu-social facebook" title="Facebook"><i class="fab fa-facebook-f"></i></a>
<a href="#" class="menu-social twitter" title="Twitter"><i class="fab fa-twitter"></i></a>
<a href="#" class="menu-social instagram" title="Instagram"><i class="fab fa-instagram"></i></a>
</div>
</div>
and you can your social links to the href attribute above