global $vbulletin; // error processing for the datamanager if needed. require_once "d:/servers/z421/web/bbs/includes/adminfunctions.php"; // Existing User $userid = 6; // Existing User ID $newusername = 'david1'; // New user name string (cleaned) $userdata =& datamanager_init('User', $vbulletin, ERRTYPE_CP); $userinfo = fetch_userinfo($userid); $userdata->set_existing($userinfo); $userdata->set('username', $newusername); $userdata->save(); unset($userdata);