bdister misstyped. The answer is "You cannot do that"
BUT,
You can go back and edit out any personal content from your posts here.
You can switch your account email to one you just created at outlook, yahoo, gmail, etc. so your current email is not on file.
Not sure why you wanted to as there's nothing personal in the original messages, but it appears you have already replaced the messages with 'deleted'. I guess that means case closed.