Change text under my username

hi, lol i've seen people have it changed, and it's not just cuz of their posts, they changed it themselves.. and idk how...
im talking about the text under my username that now says "Newbie" <=====

Normally it changes with the amount of posts you have, but once you reach 500 posts you can request a custom title, once you reach 1337 you can request a picture usertitle (like me /oya).

yeah the magic 1337