HI there, since you are already signed up with them, I do not think that you can do them. If you signup with a different email address, the system catches you automatically and you will be flagged as more than one email address from the same IP. I do really think that these are for only NEW members. I hope that helps. I know it is not the best answer, but I do not want any members getting flagged.
Thanks and let me know if you have any more questions.
Christy