SmartFAQ is developed by The SmartFactory (https://www.smartfactory.ca), a division of InBox Solutions (https://www.inboxsolutions.net)
What is the Inbox menu Item?
As you can see on the image below, the User Menu contains an item called Inbox.
User Menu : Inbox
Clicking on that menu item will bring you to your Inbox page. Your inbox contains all the Private Message you have received from this site.
On *NIX systems, you can use symbolic links (ln -s) to link your cache, templates_c, and uploads directories to folders that are outside of your web root.