Quassel IRC is a modern, cross-platform, distributed chat client. Quassel aim to bring a pleasurable, comfortable chatting experience to all major platforms (including Linux®, Windows®, and MacOS X® as well as Android smartphones), making communication with your peers not only convenient, but also ubiquitous available.
To chat on irc you need to connect to a server and join a channel. This can be done with the join button or by typing "/join [channel]". To send a query or private message directly to someone type "/query" username or right click on the user list and select start query. If you wish to view older messages just scroll up. Scroll down to view newer messages.
To add the Lubuntu IRC chat network click File-> Networks-> Configure_Networks->
+Add(Networks) -> Use preset, select Lubuntu IRC -> click OK.
To join a channel simple type "/join 1" (where 1 is the channel name), right click the network and select join channel or use the join button.