Meteobridge cannot mount your NAS network folder and directly write data onto it.
But Meteobridge can send data as HTTP or mySQL to your NAS. In order to make
use of that, your NAS needs
a) to have a mySQL DB running so that Meteobridge can connect to it or
b) to have some PHP or Perl skripts running that receive HTTP requests from
Meteobridge and store data included in a way they like to do.
Without knowing the IP or your NAS in the LAN you can't connect anyway