1) From Debian, go on a Web browser and connect to server typing its IP adress in search bar.
Put your Admin credentials to access to Main Panel.
2) Go to Network > Web Services and Enable the NFS Service
3) Go to Storage > Shared Folders and Check the NFS
4) Use MountTool and Select 7- Mount a directory (NFS/Auto Mount)
5) It will mount your folder at /mnt/nfs/server-IP/