<?php $url = $modx->makeUrl(12); $modx->sendRedirect($url);
$url = $_SESSIOn['ProfileUrl'];
$modx->sendRedirect($url, "", "", "full");
http://www.******.co.uk/forums/u/charlie
[[!+modx.user.username]]
$url = 'http://www.******.co.uk/forums/u/' . $modx->user->get('username');