To cancel your forum account, follow the following simple steps:
- Go to your Control Panel
- Select the Change Email Address option
- Change the email address to something non-existent, or an address to which you don't have access
- Confirm the email address in the second entry box
- Enter your forum password
- Enter the security code shown on the form
- Press the "Change my Email Address" button
A confirmation email will be sent to the address, and your account will be set to "validating". Because you entered a non-existent address, you won't be able to confirm it, and the account will be terminated after a period of time.