How do I setup an IRC client to login to Ustream?

IRC Clients are not officially supported by Ustream or but you maybe able to configure one to connect to Ustream's Chats.

In general, the server should be set to and the server password should be your Ustream password. Do not enter your Ustream Password as the Nick Password as it will not be sent to Ustream's servers in the correct format.

Please see How to connect an IRC client to login to Ustream for step by step instructions for popular IRC Applications.