As you can read in the FAQ, it is impossible to delete your account. They will give you some tips on how to leave it as empty as possible (but all your forum posts will remain online anyway): http://www.topix.com/topix/faq#delete_account
URLS:
http://www.topix.com
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.