In order to change your password, you should go to https://app.unchainedmusic.io/signin and click the button that says "Forgot Password?" below the purple and pink box.

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After you click this button, you will need to add your email associated with your account, then click the button that says "Reset". This will send you an email. Follow the instructions in the email to reset your password.

If you don't receive an email, please check your junk and/or spam folder.