How to remove your Pottermore account
Log in to your account, then use the direct link to delete your account.
Direct removal link: https://www.pottermore.com/en/profile/delete-account-confirm
Helpful Trick: Removing online data
Helpful Trick: Remove third-party logins
If you signed up for Pottermore using a third-party login such as Facebook or Twitter, you probably want to revoke all access from Pottermore. Click here to find out how.