You cannot seem to delete your account. Pretty weird for a company that focuses on plagiarism. Why do they want to keep a copy of your identity?
Use the contact form to ask for account removal. Make sure you mention us as it might speed up their response. See: http://copyscape.com/contact.php
URLS:
http://copyscape.org
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.