How to remove your Brickshelf account
From their site: If you wish to have your account removed, send an email to firstname.lastname@example.org. We will confirm with your registered email address and then delete your account, including our record of your email address.
Helpful Trick: Removing online data
Helpful Trick: Remove third-party logins
If you signed up for Brickshelf using a third-party login such as Facebook or Twitter, you probably want to revoke all access from Brickshelf. Click here to find out how.