To prevent those bitcoin spammers from PM'ing you, you just need to change your forum settings so that it does NOT show when you're online. Go here: http://dkn255hz262ypmii.onion/index.php?action=profile;area=account;u=49994 Under the "email" section, there's an option to show when you're online -- make sure this is NOT selected, and you won't receive any more PMs from the bitcoin spammers. As for the email address, if you've used it with another account, then you won't be able to use it on your current one - I believe email addresses can only be assigned to a single profile.