There is no option to change username in this forum. As mention by the reply above it is not possible to change username and the best way is to create alternative account.
Anyway, why want to change username? Do you feel your privacy gets compromised? Many of the users here are doing KYC including myself especially those days of bouny hunting in ICO projects. So, I think you can get used to it.
I want to change my name because a lot of people follow my old name and I don't like that.
Do you understand?
@donatello345 , it is really impossible to change your username, unless theymos decided to give you a chance. In most cases, users that are given chance to change their name are those who aren't that long enough in this forum and mostly newbies. Check this thread from Meta where a user back then has been given a chance to change his username
[1], BUT with valid reasons (I guess). BTW, Here's theymos answering on a change name thread
[2]. Even most of us wanted it to be a feature here in the Forum. But it do have a lot of disadvantages when and if implemented, mostly to run out of problems (when you are very well known).
[1] -
https://bitcointalk.org/index.php?topic=665508.0[2] -
https://bitcointalk.org/index.php?topic=232505.msg2464071#msg2464071