Make Discord bridge docs better

docs/configuring-playbook-bridge-appservice-discord.md

@@ -4,9 +4,10 @@ The playbook can install and configure [matrix-appservice-discord](https://githu
 
 See the project's [documentation](https://github.com/Half-Shot/matrix-appservice-discord/blob/master/README.md) to learn what it does and why it might be useful to you.
 
-Setup Instructions:
 
-loosely based on [this](https://github.com/Half-Shot/matrix-appservice-discord#setting-up).
+## Setup Instructions
+
+Instructions loosely based on [this](https://github.com/Half-Shot/matrix-appservice-discord#setting-up).
 
 1. Create a Discord Application [here](https://discordapp.com/developers/applications).
 2. Retrieve Client ID.
@@ -25,3 +26,25 @@ matrix_appservice_discord_bot_token: "YOUR DISCORD APP BOT TOKEN"
 7. Join the rooms by following this syntax `#_discord_guildid_channelid` - can be easily retrieved by logging into Discord in a browser and opening the desired channel. URL will have this format: `discordapp.com/channels/guild_id/channel_id`
 
 Other configuration options are available via the `matrix_appservice_discord_configuration_extension_yaml` variable.
+
+
+## Getting Administrator access in a room
+
+By default, you won't have Administrator access in rooms created by the bridge.
+
+To [adjust room access privileges](#adjusting-room-access-privileges) or do various other things (change the room name subsequently, etc.), you'd wish to become an Administrator.
+
+There's the Discord bridge's guide for [setting privileges on bridge managed rooms](https://github.com/Half-Shot/matrix-appservice-discord/blob/master/docs/howto.md#set-privileges-on-bridge-managed-rooms). To do the same with our container setup, run the following command on the server:
+
+```
+docker exec -it matrix-appservice-discord /bin/sh -c 'cp /build/tools/adminme.js /tmp/adminme.js && cp /cfg/registration.yaml /tmp/discord-registration.yaml && cd /tmp && node /tmp/adminme.js -c /cfg/config.yaml -r "!ROOM_ID:SERVER" -u "@USER:SERVER" -p 100'
+```
+
+
+## Adjusting room access privileges
+
+All rooms created by the bridge are **listed publicly** in your server's directory and **joinable by everyone** by default.
+
+To get more control of them, [make yourself a room Administrator](#getting-administrator-access-in-a-room) first.
+
+You can then unlist the room from the directory and change the join rules.