How to remove your Brickshelf account
From their site: If you wish to have your account removed, send an email to webmaster@brickshelf.com. 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
Publicly visible text/images often aren’t properly removed even when you succeed in removing an account. Try editing or removing them manually before removing the account itself. If you’re unsure what happens to your tracks: this can be found mostly in the Terms of Service/Privacy Policy; otherwise you can always contact Brickshelf and ask personally. By the way, removal requests don’t necessarily mean your data will actually be removed (e.g. due to legal obligations).
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.