xbmc/kodi over the internet

ive been trying to connect to my nas over the internet using kodi,,,,,.so far ive not had any success,,,, do any members have any guides or info on making it work....
i can connect to the nas over the internet through my web browser without any problems...i dont want to use plex or similar as it requires a pc server running all the time,,the nas has a low power consumption and a small footprint.

set it up again with my no-ip name and port number,,,,entered the remote path,,,,and tested it,,,,,it says working but the directory is empty,,,,,,,,,,,,,where am i going wrong????