Hey All -
First I am hanging my head in utter embarrassment as I am unable to sort out the answer to what I think is a total noob question, and I don't really consider myself a noob, but here goes...be gentle! 
I just purchased and set up a Synology DS416Play and transferred my movie and music collection to it. My goal is to direct stream plex from the NAS to my 3 Rokus in the house. I've got a server already set up that pulls from a PC I have running 24/7, but I don't want it to pull from there, I want it to pull from the DS directly - I know it can't transcode, and that is 100% fine with me...I can not for the life of me figure out how to get the server to be hosted on the DS. I downloaded the Plex App from the "package store" and when I click it, it opens the web UI and points to the server on the laptop. How do I get it to point to the DS and pull from the files there (the laptop server is pulling from the files on the NAS)....any help would be greatly appreciated!
-Nic