If you are sure you no longer want to have anything to do with The IECA and you want to cancel your account, you can do so from your account page. After logging in, click on your username in the upper left corner to go to your account page. Click on the "Edit" tab and then scroll to the bottom of the page. You will see a "Cancel account" button beside the "Save" button. Click on it to get things started.
When you cancel your account, all your personal data is removed from the site. If you have any questions, please just use the contact form to get in touch.