By default, your website's profile automatically uses your account's email — along with the site name and physical address you entered when first setting up your website. If necessary, you can change that information.
Change your profile setting. Changing your Site Name will automatically update change your site's current address. (See Change my website's domain address.)
When you're finished, click the home button.
Your changes are saved automatically so, when you're finished, click Preview to see the results.
When you're done, click Publish Site (mobile phone) or Publish (desktop/tablet).