“When I add a contact form and preview it, it shows MY email address in the ’email’ field. Is that visible to viewers? How can I view my pages as they appear to other people? Thanks!”
It’s because you’re logged into WordPress.com.
When you visit ANY website that’s been built on WordPress.com, your details will automatically populate the fields of the contact form — this of course includes your own website. It’s just to save you the trouble of entering them.
You can test this by visiting my contact page. You should find the form fields auto-populate with your details.
To see a website through the eyes of a “normal” visitor, log out of WordPress.com by hovering over your user image near the top-right of the screen (on a laptop anyway) and clicking “Sign Out”.
The form fields will appear blank to a “normal” visitor, as you’d expect. Because I like to stay signed in, I use a completely separate browser (in my case Firefox) to view my websites through the eyes of a regular visitor. Hope this helps!