Username change

I know this topic isn't new but i'm just asking how do I change my username ? the sole reason for this is quite hard to explain but i'm really feeling insecure about my current one since it's almost close to my real name ("Michizuna" is just how some of my relatives call me for whatever reason.)

if i posted this on the wrong forum please feel free to redirect it thank you.

Try and get a hold of Jacob. Good luck.