Hi there, it seems that you have found the way how to change the user name, as I entered your homepage and found that it has been changed successfully. Just check the below screenshot. If there is anything else we can help, feel free to contact us.
Hi there, we see your username has been changed, the username can also be changed via the APP, you just need to select the PC version at the bottom of one thread.
Please let us know if you have any other concern.