I responded to this in the other thread, however you can't "delete" an account such that the email used for it will be usable for a new account. "deleting" refers to just removing the local data from the machine and not wiping the account from the Sony servers. Whether Sony can do this at your request I don't know, although I doubt they'd want the bother.
yep i want to delete a psn account aswell as a sub account...anyone know any idea how to delete the accounts because i want to use that email address to make a new psn name cos i dont like my old one...
well, how do i delete/ remove a sub account from a master account.
You can't but what you may be able to do is get your cousin to log in on his account and go to account settings and change his e-mail to another one. That then frees up that e-mail for a new account.