Various updates

source/_components/media_player.plex.markdown

@@ -14,20 +14,23 @@ featured: true
 
 
 The Plex platform allows you to connect a [Plex Media Server](https://plex.tv) to Home Assistant. It will allow you to control media playback and see the current playing item.
+The preferred way to setup the Plex platform is by enabling the the [the discovery component]({{site_root}}/components/discovery.html) and requires GDM to be enabled.
 
-To add Plex to your installation, add the following to your `configuration.yaml` file:
+If local authentication is enabled or multiple users are defined, HASS requires an authentication token to be entered in the webinterface. See <A TARGET="_new" HREF=https://support.plex.tv/hc/en-us/articles/204059436>Finding your account token / X-Plex-Token</A>.
 
+
+If you want to enable the plex platform directly, add the following lines to your `configuration.yaml`:
 ```yaml
 # Example configuration.yaml entry
 media_player:
-  platform: plex
-  name: plex_server
-  user: YOUR_USERNAME
-  password: YOUR_PASSWORD
+  - platform: plex
 ```
+You may also need to create the file `plex.conf`. 
+```
+{'IP_ADDRESS:PORT': {'token': 'TOKEN'}}
+```
+- **IP_ADDRESS** *Required*: IP address of the Plex Media Server
+- **PORT** *required*: Default is 32400
+- **TOKEN** *Optional*: Only is authentication is required. Set to `None` (without quotes) otherwise.
 
-Configuration variables:
-
-- **name** *Required*: The name of the backend device (Under Plex Media Server > settings > server)
-- **user** *Required*: The username for your Pley server.
-- **password** *Required*: The password for your Plex server.
+At this moment, the Plex platform only supports one Plex Media Server.