Actually I use KODI on my QNAP NAS - but unfortunatelly they drop supporting it.
Not to end up with an old system I try about using PLEX - I already installed the MediaServer on my MacBook and also on my NAS - and there it ends 
I dont like the pre installed skin - but theres NO WAY to change the skin - or co configure the look and feel
Theres Faqs on the PLEX webpage - but Im too stupid to find answers about how to configure the system to what I need.
I need PLEX basically for playback of my movies - theyre all in 1 folder and organized.
All I want is a system that gives me a nice library of my movies and can download additional info plus subtitels.
BUT everytime I sit down on my NAS or on my MAC for a “ok lets see how this could be done” session I end up frustrated as I find NO way for doing what I like doing.
So pls tell me someone WHERE I can find Faqs that desrcribe how to change skin, configure skin, configure additional things in PLEX.
Thank you.