The main organizers can create the message in the organizers tool, in Configuration - Mobile Application - Push Notifications - Create Push Notifications.
Creating Push Notifications
- Choose whether is a draft or schedule it: choose Draft when you don't want to publish and send it yet; choose Scheduled to set the date and the hour of when the notification will be sent to the participants
- Choose the Target/Participants List - select among the filters (hyperlink missing) which were previously saved in the advanced search
- Choose a title for your notification
- Write your message in the Message box
- Click on Save.