This is an old revision of the document!
Above the list of teams, you will find a button to Email Captains, which you can use to send a group message to all of the captains of the teams. When you press the button you will see a form like this:
Here you can change the subject and body of the email. You also have the choice to email every captain in the Knockout, or just the captains who currently have unplayed matches pending.