If you are trying to access your free trial and receive the message that your email address is already in use, this means you have already registered at some time in the past. In this situation please contact customer service, and if you have not used your trial previously or would like to try the program again they can apply another trial to your account (conditions may apply).
If you need to reset your password you can do so here: https://app.readingeggs.com/password_resets/new