How to remove your TED account
In the Q&A section, you will find that you need to use the contact form (see link) and request account removal. Not 100% neat, but good enough.
Direct removal link: http://support.ted.com/customer/portal/emails/new
Helpful Trick: Removing online data
Helpful Trick: Remove third-party logins
If you signed up for TED using a third-party login such as Facebook or Twitter, you probably want to revoke all access from TED. Click here to find out how.