Much fuss and unclarity here. You should contact them using webform to ask for account deletion.
At Typepad it is only possible to deactivate your (free) account automatically. See also http://faq.typepad.com/faq/2010/04/how-do-i-delete-my-profile.html and http://help.typepad.com/cancel.html#cancel-free
URLS:
http://www.typepad.com
http://www.sixapart.com/about/contact/typepad-support-contact-us.html
Please note that AccountKiller.com is not associated with the business listed on this page. AccountKiller provides easy-to-understand instructions and guides on how to cancel charges and relationships from the list of businesses on our site, we have no affiliation with these businesses.