If you want to edit a Broadcast Message before sending it:
- Navigate to the Messaging section on the left-side menu.
- Click on the Broadcast symbol located above the Search Conversations bar.
- Click on the Scheduled tab
- After that, click on the pencil symbol (on the right side of the message) to edit the Broadcast Message.
Remember that after the Broadcast message has been sent, you will no longer be able to delete or edit it.