Glad you like the theme 🙂 You can do this by inserting the following CSS into Custom CSS tab in the Theme Options panel or the /custom/custom.css file. Thanks –

#header.sticky .social-container {
display: block;
top: 10px;
}

You may need to set aside some space for it too so that menu and social icons do not overlap –

#header.sticky #primary-menu {
margin-right: 200px;
}