If you wish to use local host names, that cannot to be found via DNS lookup, you can add those names to the /etc/hosts file through the NAS4Free Web UI.
Network/Hosts
Click the "Plus" button to add a new host name.
Hostname: (the name of the host)
IP address: (the host's IP address)
Click the "Add" button at the bottom of the page.
Click the "Apply changes" button to make the host names usable.
Click "Save and Restart" because you can never have too many buttons to
click.