Plex Media Server installation on Netgear ReadyNAS 212

Hi, I’m new to Plex and wanted to use it to run my media via my new Roku but am having getting started issues.
To explain, I have a Netgear ReadyNAS 212 downstairs with my movies and music stored on it. Upstairs I have a Roku plugged into my TV. To use Plex on my Roku/TV to stream content wirelessly from my NAS do I need to install Plex on any computer like my Mac laptop (which I have done but it won’t launch) or does it need to be installed on my NAS? (which I don’t know how to do).
Any help would be really gratefully received.

  • Plex is there in my Roku/TV interface but it can’t find any media libraries on the network, which I guess isn’t surprising.
  • I’ve been doing the same thing previously with a WDTV but want to switch to a new Roku. The WDTV had no problem finding my NAS on the network and streaming from it to my WDTV upstairs

Thanks

Related to https://forums.plex.tv/discussion/310042/how-does-plex-work-with-netgear-readynas#latest

Please don’t post almost identical Q’s