The "bunch of code" is various messages concerning the system.
Once that's finished you'll see conversations occurring between people in the chat room - these will display in the main window.
At the bottom of this is a narrow strip: type what you want to say in there and press Enter - you should then see it appear in the main screen.
Congratulations - you are now talking on an IRC channel.
There are loads of other commands available to make things easier and do other nifty tricks - Googling for IRC tutorials or IRC basics should get you going with those.
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Giraffe: a ruminant with a view.