If you want to use Social Login by YITH and you are using WooFood theme ,copy and paste the following snippet inside functions.php on your child theme.
if(!is_admin())
{
add_action( 'woofood_login_popup_after_register', array( YITH_WC_Social_Login_Frontend(), 'social_buttons' ) );
add_action( 'woofood_login_popup_after_login', array( YITH_WC_Social_Login_Frontend(), 'social_buttons' ) );
}The above code will make social login buttons appearing both on Login and Register section inside popup