Click on the + button to add a Notification, indicated below.

In the box that appears on the right, select which application you would like to send the Notification to. Currently you can only send notifications to the Stand app. With Stand selected, you can then choose which profiles you would like the message to be sent to, alternitvely you can choose to send the notification to all profiles by enabling Send to All Profiles.

Enter the Title and Message you would like to send, then choose whether you want the notification to be in the form of a Push notification. Set the Notification to Active.

Click on Save to store the configuration, or click on Cancel to discard changes, and return to the Notification Overview. The notification will be sent immediately after you click Save.