iWin makes it particularly hard to cancel an account. You might be able to use this form to request cancellation: http://support.iwin.com/ics/support/ticketnewwizard.asp?style=classic
Include your username and the email address you used to register the account.
Please note that AccountKiller.com is not associated with the business listed on this page. AccountKiller provides easy-to-understand instructions and guides on how to cancel charges and relationships from the list of businesses on our site, we have no affiliation with these businesses.