As a new member
no contribution, you can not get acceptance to change your username, in most of cases. So as other members told you, let's move on with a new account. Exception is if your current username contains something that can be used to dox you later.
Done. Now only moderators, Donators, and VIP members can change their names automatically. Other members should contact me. I'll probably ignore your request if you have less than 50 posts (unless your posts are very good).
You can't. You can try PM an admin and they may do it, but they usually don't. You can just create another account with that name if you feel like you need it.
Sometimes theymos will accept request from old members to change usernames but it won't be approved too commonly. Provide good reasons to convince theymos why current usernames should be changed.
Hint
- Even if you see your username changed, it is not changed actually.
- Just display name is changed, the initial username still does exists and is used to keep tracing your account
Each user has a display name, which is the only name ordinary users see, and a username, which is what you use to log-in with. Almost always, they are the same.
If I change a name for reasons of appearance, then I only change the display name. The username remains reserved, the user can still login using the username, PMs can still be sent to that username, "search member" allows searching for the old username, etc.
If I change a name for reasons of privacy, then I change both the username and the display name. In this case, it is possibly hazardous to reserve the old username, since it allows someone to test for the existence of that username, possibly defeating the privacy benefit. If you're worried about being impersonated, then simply don't seek to have your username changed.