Not sure why you would want to, but the easiest way is to just stop coming here, Paul will keep your account around in case you come to your senses and decide to come back. If you really want your account gone for good, you would probably need to PM Paul and ask him to remove the account. He's away on some personal time right now so don't expect to hear from him for a bit, but I see no reason not to leave your account as it is and just dont post, It's not taking up any resources if you're not using it, and deleting it may delete all your posts in the process, which is counterproductive to keeping this site up as a source for reference.