Make sure you have a flash player installed. The web irc client link on the website uses flash. Might be disabled in your safari or not installed at all. (Flash is kind of dead these days). Here is how to check. If it's installed and should be working, just uninstall and re-install it. If you don't want to use flash you could try kiwi (it uses html5/js). https://kiwiirc.com/client Set the Channel to: #renaissance Just click the tiny "server and network" link/drop-down and use these details: Server: irc.chat4all.org Port: 6667