Your username is a unique identifier for your profile. It can contain letters, numbers, hyphens and underscores only — no spaces or other special characters.
If we detect a username or display name that violates these policies or that we consider inappropriate, we may change or remove it — and, depending on severity, issue a temporary or permanent ban.
Username changes are allowed only for a valid reason (for example, a misspelling), because changing usernames can confuse other members and reduce accountability. If you have a valid reason, contact support via the Feedback form.