Note that you can only deactivate your account, and information on deleting an account is quite hard to find.
To deactivate your account, make sure you are logged in, and go to https://www.ayi.com/index.php?action=AccountSettings
Go to the last section, “Deactivate Your Account”, and click “DEACTIVATE”.
To delete your account, go to http://help.ayi.com/customer/portal/emails/new?q=pleas+delete+my+account and fill out the form.
From the topic select box, choose “Account Removal”.
Always mention AccountKiller, it usually speeds up the process a lot!