How do I change my Ingame name?

[Poppi Chullo]

I felt like I needed to change my name to better suit my roleplay character.

[Fyrd Argentus]

This is not something you can do.  You could petition the Admins to do it for you, and if you made an excellent case, in raw occasions (rarer than rare) they might be willing to do it for you.  Some momentous in-game event that would explain the name-change might improve your odds of being heard, as compared to a casual whim. 

Of course there is nothing preventing you from using nicknames in chat, and asking to be addressed in a certain way by other players.