To preview your website from a guest's perspective before publishing your website, click on the square icons next to "Website" or the "View site" link.

This will open up a new tab in your browser with your wedding website. You'll notice there is a navigation bar up at the top (not visible to guests) that will allow you to go back to your admin dashboard. But if you want to see your website exactly how your guests would, you can click the "View as guest" option.