If you want to cancel your customer account with LoveKnitting or LoveCrochet, please log in and go to My Profile. At the bottom of the page, you can click the link ‘Deactivate my profile’.
If you're deleting your account because you don't want any more emails from us, you should know that your customer account on the website and your email subscription are separate. Deactivating your profile won't change your newsletter subscription.
See also: how do I unsubscribe from your emails?