Hubot with Rocket.chat

I am trying to integrate Hubot with rocketchat and make Hubot talk with rocketchat.

The sources I am referring to are:

https://hubot.github.com/docs/

https://github.com/RocketChat/hubot-rocketchat

I have installed Nodejs and in Node.js command prompt I did:

mkdir myhubot
cd myhubot
yo hubot

Questions I have:

1. How do I understand if rocketchat is integrated with Hubot?

2. If I have not integrated rocketchat, how should I do it? (I did refer to https://github.com/RocketChat/hubot-rocketchat). Here, I want to understand how and where to set environment variables. Also, how exactly do I run Docker here?

3. When I do docker export ROCKETCHAT_ROOM='https: //spree.chat/channel/'

   It returns: "Cowardly refusing to save to a terminal. Use the -o flag or redirect."

   How can I resolve this?

Here is the screenshot:

1.) Rocket.chat have "Internal hubot" which is integraded and contain some simplest Hubot scripts. Ideal for testing and introduction to Hubot. You can find these scripts in rocketchat/programs/server/npm/node_modules/meteor/rocketchat_internal-hubot/node_modules/hubot-scripts/src/scripts/.
If you wanna use more complex scripts, you must use external Hubot.

2.) Setup "Environment Variables" are different for each platform. For example, if you want set ROCKETCHAT_ROOM to support, you must use something like env ROCKETCHAT_ROOM=support. But this only applies to Linux OS. For Docker syntax is -e ROCKETCHAT_ROOM=support. If you running external Hubot on Windows, you probably must use something different.

3.) ROCKETCHAT_ROOM variable is not for URL of your channel. You must put here name of your chat room.