Restricting access to a Section
From Joomla! Documentation
This article is for Joomla! CMS Version(s) 
1. Navigate to Content > Section Manager
2. Select the Section you wish to edit. When the page loads, change to Access level to Restricted so that only users who register to your site can see the Section; or Special so that only users with an Access level of Manager or above can see the Section
3. Click on the Save button
