You can reset your password here.
Enter your email in the relevant field and then select 'Request password reset'. You will then receive an email with instructions to update your password.
If you are trying to sign in with Apple/Google, please use the password for your social account. If you cannot log in using this password, you will need to reset your Google or Apple password on the respective platform. Alternatively, you can reset your password on ATG Tickets to add a new password.