How do I change my name/handle here

Hi, sir, this is also my problem just face your one user before me, please also solve this issue for me. I seem to have landed up with a rather generic user name ('Othered'). I want to change it to my real name or a nickname that others will know me by. How do I do this? I went into my user profile and put the correct information in, but I can't seem to find how to change the 'handle'. Thanks.