Board Thread:Support Requests - Getting Started/@comment-24824686-20140430231741/@comment-4832646-20140501123600

If you want to protect a page from being created, it's the same as protecting a normal page. Go to protect, the click "Administrators Only" or "Block new and anonymous users" then hit the button at the bottom. If you're trying to protect an already existent article, it's the same way.

Although, if this isn't what you're trying to do, again, please clarify.