You'll have to contact the owners of the redirect service that it's listed too. Please read here:
http://www.unrealadmin.org/uz
It will tell you most of what you need to know and show you where to find the people who host the servers that are listed on there. Make note that no files are hosted on the unrealadmin.org site and that gameservers.net no longer offers a free public redirect.
If you'd like to have a free redirect server for your server with the ability to upload your custom content, then take a look here:
http://news.ut-files.com/