That code won't do anything for you... you'd have to modify the PHP file that's generating it. Look at the URL while you're on that page, and it will probably point you to it.
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /><meta name="rating" content="general">
<meta http-equiv="refresh" content="5;url=portal.php">
<title>Bodybuilding forum worldofmuscle.co.uk! - Redirecting....</title>
<style type="text/css">
<!--
body {
background-color: #003366;
}
.style1 {color: #FFFFFF}
-->
</style></head>
<body>
<div style="position:absolute; left: 225px; top: 158px; width: 563px; height: 262px; background-color: #CCCCCC; layer-background-color: #CCCCCC; border: 1px none #000000; z-index: 2;" id="redirect">
<div align="center">
<p><strong>Bodybuilding Forum World Of Muscle </strong></p>
<p><strong>You will be automatically redirected to the homepage in 5 seconds... </strong></p>
<p><img src="templates/Cobalt/images/logo_phpBB.gif" alt="worldofmuscle.co.uk" border="0"/></p>
<p><strong>Redirecting........</strong></p>
<p><a href="portal.php"><strong>Click here if you do not wish to wait....</strong></a></p>
</div>
</div>
<div style="position:absolute; left: 227px; top: 436px; width: 559px; z-index: 3;" id="info"><span class="style1"><strong>Note:</strong> To enter The Bodybuilding Forum now, click the link above </span></div>
<div style="position:absolute; background-color: #FFFFFF; layer-background-color: #FFFFFF; border: 1px none #000000; left: 216px; width: 582px; top: 148px; height: 283px; z-index: 1;" id="border"></div>
</body>