Here are the guidelines for custom usernames on ChessKid:
Usernames on ChessKid may be 3 to 20 alphanumeric characters with no spaces or symbols other than - (dash), or _ (underscore), and these cannot be at the beginning or the end of the username. Usernames must also be appropriate for young children; no adult or violent themes may be used. If your username is not approved, you will receive an email or message in your ChessKid Inbox.
If you are unable to log in with your old, or new username, please EMAIL US and a support agent will get back to you.
From your ChessKid Parent account home page,
Click on "Settings" followed by the "Edit" icon:
Here, type in your username request and then click "OK":
**Please note: Our staff will then review your username request. It may take a few days, depending on how many requests we have. While you're waiting for approval, please continue logging in with the username given to you at sign up.