If you forgot your password
If you would like to log in but forgot your password, you can restore it:
Click on the "Sign in" button in the right upper corner of https://chessarena.com.
Type in your email address, and click on "Reset password". You will receive instructions on how to restore your password over email.
If you’d like to change your password
Log in and click Accoint —> Change details. You will see a ‘change password’ option. Click it and follow the prompts.