Basic Apple usage

To find any software or navigation around your make click on the Finder button

To add more visibility of USB drives, NAS etc then go into the top menu and select:-

Finder - Preference key.

This will bring up a new screen that allows you to select what you want to see in this Finder view
Select Connected Server for previously assigned NAS's and External drive for USB's

To add a folder to the Finder list,

       Select Finder,  
           then GO on the Finder Toolbar
               Then Go to Folder

For the Linn Promotions enter /users/Shared

To add a NAS to the Connected Server,

       Select Finder,  
           then GO on the Finder Toolbar
               Then Go to Folder