Maybe you should try a graphic IRC client. There are several which seems to be more self-explaining than irssi (I just checked it and could not use it, although I know how to use IRC - a least the basics). If you are using KDE I would recommend Konversion. Another well-known IRC is xchat, but I don't know it well. If you are using Gnome there should be an "build-in" IRC client as well, but this someone else needs to tell you...
In the IRC client you should be able to set up a connection to the freenode server (chat.freenode.net) - at Konversion just press F2 and select 'new'. in the lower part you can enter the mageia-qa channel so that you will connect automatically each time Konversation starts. Otherwise you can simply join the channel by typing '/join #mageia-qa'. But as I said in the most graphical IRC clients there should be also some menus to join channels...
here is a list of different IRC clients:
http://www.linuxlinks.com/article/20090 ... 7/IRC.htmlPlease try it out...