well without knowing the exact model, I'm shooting in the dark, but that never stopped me before.
What you have is likely an external HDD that supports some type of iSCSI or FCIP protocol, meaning that it will abstract the blocks of data on your HDD and present them to a target device over the IP network. This is generally a faster way to move data than USB 2.0, but slower than SATA or maybe USB 3.0.
In either case, you need to load a driver on the host, which will allow the host to see the initiator box (NDAS) and allow the host to use it. If you have windows, this means that it will show up as a drive letter just like a locally attached storage disk.
As for NAS software, you could load something on your host, but then you would need to dedicate the host to that function AND you would need the NDAS driver for that host OS...and the software would need to know how to use it. So that's not likely.
The NDAS likely doesn't have a full processor CPU stack that you can load an OS on, so that precludes using it as a NAS device directly. I would say, your best choice would be to use it for seconday storage to a windows system.