here is thee complete list of ntl proxies... pick one that is local to you.
http://www.cableforum.co.uk/board/article.php?a=10
If you are using Internet Explorer, you need to go to tools-> internet options-> connections-> lan settings and tick "use a proxy server" the port number is always 8080.
If you use mozilla firefox, you need tools-> options-> connection settings -> manual proxy configuration.