Before trying it out here's some information you'll need.
Icicle is still a prototype.
In particular, the server may be taken down with no notice, which will likely freeze the chat applet on the web page. Several times if necessary. Icicle consists of an administrative page and a client page. The two pages are nearly identical, save that the server can control the page displayed in the client browsers. However, the system is not signed, and if you which to try out the demonstrational piece, you will need to grant security privileges to the system.