Change your Chess.com username
Scroll down to the 'Details' section and click 'Change' next to your username.
Enter your new username and your password.
If you registered with a social account like Google, Apple, or Facebook, you won't be asked for a password to complete the change. But if you do, simply setup a password first with the Change Password and then try to change the username.
Click 'Save' to apply the changes.
Mobile
The following steps apply to users who registered with an email and password, as well as those who signed up using a social account.
Tap 'More' at the bottom right corner of your screen and select 'Profile.'
From your profile screen, tap on the three dots in the upper right corner of your screen, and select 'Edit Profile.'
Next, tap on your username. Enter your new username and select 'Continue.'
If the username you entered is valid, you will get a confirmation box. Tap 'Yes' to apply your changes.
Please choose carefully. Members can only change their username once every 90 days!
Important to remember
Your username must be at least 3 characters long and can only contain letters, numbers, underscores (_), and dashes (-). It must begin and end with a letter or number, cannot contain spaces, and cannot consist only of numbers.
You cannot change your username if you are in a Live Chess game in another window.
If the username is taken, a notice will say it is unavailable.
Check out this article to learn what types of usernames are and aren't allowed on Chess.com: What kind of username can I choose?