How do I change my user name

I did not set up my username properly when I set up my account, and I could not find an option to change it. I tried to figure out where can I do it but there seem to be no instructions for changing user name. I have seen people posting on forums for user name change and so I am doing the same thing. I am not sure if this is posted at the right place. But if it is possible, can my user name be changed to "南山小八嘎“ please?

Thank you

Done. You may have to log out to see the change reflected here.

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Thank you very much

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