Plex's interface is easy enough to navigate, but there are numerous ways to adjust it to your liking. You may focus on specific libraries, hide categories altogether, or even change the way Plex looks ...
Launch the Plex interface on your NAS. Opens a new browser window. Then on the left it should have libaries, (hover next to it) hit the plus to add one. Select media type (movies, tv, etc.) The next ...