This video covers how to create and test a chat sequence on Facebook Messenger. First, you create the chat sequence in the Facebook Messenger app. Then, you subscribe to the chat sequence by clicking the "Subscribe Now" button. After subscribing, you can view the subscribers in the chat sequence by going to the "Chat Sequence" tab. To test the chat sequence, you can set the delay to one minute and then subscribe to the chat sequence. After subscribing, you will receive the first message in the chat sequence.