If you would like to explore IRC further, or just have a better experience, try one of the many free clients.
Xchat - This is my favourite.
irssi - console based, and very powerful.
Mirc - Has been around for a very long time. Many scripts and addons.
Colloquy - I've never used IRC on a Mac, so I just based this on being the top search result. Let me know if there is a better choice.
Using a client embedded in a website probably won't give mobile users the best experience. If you're on a mobile device, you can use an IRC app for a much better experience. A few of the better rated apps are listed below.