For configuring the bot, first add him to your room or message him privately. Bot support both spaces - private chat and rooms. Bot will greet you with crucial info to start using him.
Please note, that any messages to bot requires to be annotated by @Atlas mention. When you paste messages to the bot - they may not be annotated properly. This is a UX of Hangouts Chat which requires you to specificely mention anyone. This is why, please type the @Atlas mentioned manually and paste the rest of the message.
In private chat you can omit @Atlas annotation in messages to bot.