Right firstly download mIRC(this guide is based around that but with common sense it can be applied to almost any IRC)
Now you should see a window with a side panel menu and some input boxes, close that.
In the white box behind type the following
Code:
/server irc.freenode.net
or if Rob ever switches to gamesurge
Code:
/server irc.gamesurge.net
then let it load a channel list will appear close that and in that white box type
Code:
/join #chromespot
easy and simple, if you need to get a new nick type
Code:
/nick <yournickhere>