A good guide is available here:
Freenas 9.2.0 with Transmission and Couchpotato/Sickbeard as a DLNA-Server
A good guide is available here:
Freenas 9.2.0 with Transmission and Couchpotato/Sickbeard as a DLNA-Server
There is a great tutorial on how to set up FreeNAS with Transmission on the FreeNAS forums: