How to make your site visible so that others can see it.
The publish button
Click the Publish button to publish your site
Give your site a name
This doesn't have to be your domain name (don't add www), just something you want to call your site to distinguish it from the other sites within your account (in case you have more than one).
You can either close the message and go back to editing your site or you can click on the link Go to site to see your published site.
Site settings
If you want to change your site settings go to Manage (1) and click on Site status (2)
Site visibility (3) allows you to set your domain as online or offline whenever you want to. If you have already mapped your domain to your site, you can choose your TLD as your Preferred domain (4) (i.e. www.mygreatwebsite.com instead of mygreatwebsite.something.net).