you won't be able to do it. although there are several cases of members who have succeeded in changing their names. it is of course worth paying attention to their contributions on the forum and the admin may consider renaming.
I don't know what your reason is, but what's wrong with that name? that's not your real name, right? Or if it is, who will care when you don't share your social media content or details on forums, you will still be fine.