If you created your BHW account within the last 7 days and made a mistake with your username, you can request a change, regardless of your membership level. If this applies to you, please contact Support to request your username change.
Otherwise, username changes are only available to upgraded members. If you are a Jr VIP, Premium member or Marketplace seller, you can request a username change once per year by contacting Support.
Usernames can only be changed once per year. This rule is in place for many reasons, but it's basically to protect our users from spammers, previously banned members and people who have bought accounts and are up to no good.
Read more:-
https://www.blackhatworld.com/seo/can-i-change-my-username.1040791/