As you can probably see, the forum is divided into 2 areas - one that anyone can access and one that requires you to be a member.
ONLY this "General Discussions" section is visible to the whole world and that includes indexing services such as Google. Anything you post here will be visible to anyone who finds the site. However, the only personal information about you that will be exposed is the "screen name" you have chosen (Nacho in my case) and the little picture of yourself if you have posted one. There is a "members-only" discussion area intended for (guess what ...) members only. Check the name before you post!
The email address that you use to become a member here is ONLY seen by Lee and is never exposed anywhere on this site. She needs to see your address to make sure you are a bona fide member. The forum system will use that email address to send you notifications about changes to any topics you choose to "follow".
Any details that you add to your member profile are visible to all other members but not to the general public.