Use the direct link and follow the instructions to deactivate your account.
URLS:
http://memrise.com
http://www.memrise.com/settings/deactivate/
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.
Be extremely careful when closing your Memrise account. I recently deactivated mine, and the Memrise team refuses to delete my courses under their “terms of service.” The site is extremely devious in their efforts to steal your hard work to promote a site that, quite frankly, is getting poorer as the team continues to tinker with the functionality of the site.