In 2g2 or on your message board on your profile page, did you receive a notice from someone saying they had more information on your family? If you received a message from someone on your profile board, there should be a link back to the profile of the person who wrote the message. Follow the link to the other's profile and then send a private message. The email addresses are privately set by wikitree. By sending a private message, you are able to contact the person who has the info. If on 2g2 though, if the person who leaves a message saying they have info and then sgns in as anonymous, there would be no way of contacting them unless they leave a email address on their message.