BuddyPress.org

Hi,

Does anyone know how to remove the Join Group option for Private groups based on a WP Role?
Was thinking of using below, but need to work out how the button is called.

$current_user = new WP_User(wp_get_current_user()->id);
$user_roles = $current_user->roles; 
foreach ($user_roles as $role) {

   if  ($role == 'subscriber' ){
     //code here for subscribers
   }

Thanks to anyone who helps