how do I change my user name?

apparently you can add a second name - for a sensitive reason, but am not sure about changing on a permanent basis. You could create a new account - I'd use a different email address though

Not too sure that you can. Think “they” (GNHQ) will let us change our username for a “sensitive” reason). Reckon the best thing to do is close your account and leave. If you do that apparently you cannot use your original user name when you rejoin so have to choose a new one. Good luck, hope it works!