Members are not able to delete their own messageboards or any activities for that matter. I can't believe Elgg does not allow for members to delete their own posts or activities such as befriending someone. 

I have tried the following in the start.php of the Facebook_Theme without success:

After the command elgg_unregister_plugin_hook_handler('register', 'menu:river', 'elgg_river_menu_setup');, I put the following: 

elgg_register_plugin_hook_handler('register', 'menu:river', 'elgg_river_menu_setup'); 
function elgg_river_menu_setup($hook, $type, $return, $params) {
if (elgg_is_logged_in()) {
$item = $params['item'];
$object = $item->getObjectEntity(); 

if ($owner) {
$options = array(
'name' => 'delete',
'href' => elgg_add_action_tokens_to_url("action/river/delete?id=$item->id"),
'text' => elgg_view_icon('delete'),
'title' => elgg_echo('delete'),
'confirm' => elgg_echo('deleteconfirm'),
'priority' => 200,
);
$return[] = ElggMenuItem::factory($options);
}
}
return $return;
} 

However, I got Fatal error: Cannot redeclare elgg_river_menu_setup() (previously declared in C:\xampp\htdocs\sites\elgg-1.8.13\engine\lib\navigation.php:345). I need help.

Thanks.