To dispatch change-related notifications to users:
Go to the change details page, click Actions and select Send Notifications.
Fill out the notification as shown in the screenshot below and click Send.
Users involved in a change can now converse with each other through emails and stay aware of all the conversations that take place within the change. All notifications of a change are bundled under Conversations from where you can reply to and forward notifications. This tab accomodates system notifications, user emails, user replies to change notifications from external mail clients.