How to post course announcements
From the course homepage, click on the “Announcements” block at the top. Then, click “Add a new topic”. Enter a subject and message in the required fields. You can also attach or upload a file by dragging and dropping the file from your desktop to the “Attachment” dropbox.
If you are posting multiple course announcements, you can check the “Pinned” checkbox to keep a particular post at the top of the list. You can also check the “Send forum post notifications with no editing-time delay” option to post an announcement immediately (without an editable grace period of 30 minutes).
To display a message for a specific period of time, click the “Enable” checkbox next to “Display start” or “Display end” and enter a time.