How do I make an Announcement?
Announcements are simple to make in Canvas.
Note: In your notification preferences, you can choose to receive notifications for announcements created by you as well as replies to announcements you've created.
Make Announcement Button
Click the Make an announcement button.
Type a title for the announcement in the topic title field  and add content in the Rich Content Editor .
Once you save the announcement, it will show up on the announcements page.