Connection is easy: on the setting page - Integrations - Slack

  1. press the 'connect slack green button'
  2. follow the instructions to sign in to your slack, and authorise the connection.
  3. choose which channel you want to send the messages to

When you're done it will send the information back to BRM and look something like this:

If you don't have a Slack account you can create one (for free) here

See Also

Slack integration overview