How to work with default chat?

Hey people. (yes - me again)

I have another conundrum; how do I change the default chat to show things like prefixes etc.
And generally how do I work with it in different aspects?

You can use one of these two hooks for this, or both:
Gamemode.OnPlayerChat
Gamemode.PlayerSay

You are the kind Brandon!
Please be my friend! xD