Redirect from Members Area to Blog

Does any know how to create a button or some other feature to Redirect a Member from the Members Area of the Main Site to that members blog (child site) admin area?

I found this code that is to redirect a signed in member at login, But do not know how to manipulate it be able to have a link or button so the Member can access this WP ADMIN FOR THEIR BLOG at their discretion.

ID != 0) {
$user_info = get_userdata($user->ID);
if ($user_info->primary_blog) {
$primary_url = get_blogaddress_by_id($user_info->primary_blog) . ‘wp-admin/’;
if ($primary_url) {
wp_redirect($primary_url);
die();
}
}
}
return $redirect_to;
}
add_filter(‘login_redirect’,’ds_login_redirect’, 100, 3);
?>

Thanks for any assistance