How Do You Put "Penguin Name:_____" under your avatar spot

[PenguinAye]

i seen many people with "Penguin Name:______" and im wondering how do they put that there,can somebody tell me how to put it there?

Can anybody please help me?? i want to use those

[Oreo]

First go to User CP.
Then, click edit profile.
Scroll down under to additional information.
It should be under occupation.
Hope I helped.