How To: Delete Your Trillian Account
You can delete your account from this page:
Sign into that page and then click the "Delete my account" button in the middle of the following page. Enter your Trillian username and password again and then click the "Email Me" link. A code will be sent to the registered email address on the account that you can enter and finish the process. If it doesn't arrive for you please check your spam folder and make sure that it didn't land there by mistake.
Let us know if there are any problems.