Information: When you are talking on a channel and msg to someone on that window, you don't have to type full nick of him/her if you use this addon.  Plus, you will have the ability to use custom colour on your msg.

Configuration: Click on 'Run setup panel'. See how I have configured it according to my wish.

Note that as I used "[" , "]" and ":" for style, nicks on my msg will be viewed like this: [nick]: message-here . Now click on 'Preview the message'. You can now get an idea how the nick completor will work. Read 'Usage' below.

Usage: Type The First Letter or First Few Letters (if there is more than one nick beginning with the same letter) and Then Type : And Then Write Any Msg. Suppose, there is a nick 'RishaN' on a channel and I typed in that channel window: r: hi, how are you? The message will be sent as this: [RishaN]: hi, how are you? If there are more than one nick beginning with "R" then you have to type more than one letter (i.e. ris)