These support documents can assist you with installing Plex on Synology NAS. I suggest you read through the “Installation & Setup” document before proceeding. It will help you avoid common pitfalls. The FAQ has many helpful pointers for running Plex on Synology NAS. You should scan it as well.
Installation & Setup of Plex Media Server on Synology
Synology FAQ - Questions, Answers, and a few How-To’s
Regarding installing the current version of Plex Media Server:
You can install the current version without uninstalling the beta version. The current version will replace the beta version. Your libraries will be preserved. You will not have to re-create them.
To perform a manual installation, download the updated software to your PC/Mac. Then login to the DS920+, launch Package Center, and click the Manual Install button. You will then be prompted to select the file you just downloaded. Follow the prompts from there.
When you install the current version, it will create a new shared folder, PlexMediaServer. This folder is exclusively for use by Plex Media Server. It holds the database, downloaded metadata, and other information used by Plex Media Server. Do not place any of your own media files in the PlexMediaServer shared folder or any of its subfolders.
