Delete
Simply click the Delete button on the editing form and confirm you really want to delete the page. It will be as if the page never existed so be careful there are no other pages linking to it on the website or from anywhere else on the Internet.
Remember, Google will take a while before it re-indexes the site so the page may still show up in search results. As long as it is not cached visitors will see the Page Not Found page. If you Un-publish the page, visitors will see the Access Denied page.
Unpublish
You should try not to ever Publish a page before it is ready, but it’s sometimes unavoidable. Once it is “live” there is a good chance that it has been indexed by Google or even linked to from another website.
Google will take a while before it re-indexes the site so the page may still show up in search results. As long as it is not cached visitors will see the Access Denied page.
How To
There are 2 ways to Unpublish
From the Review Content page, check the box next to the piece of content you want to unpublish. Select Unpublish from the Operations drop-down and hit the “Execute” button.
From the Moderation tab for the piece of content you wish to unpublish, select the “Unpublish” link that is available in the Moderation Actions area.