Announcements are course-level communications from the educator to the students. These are one-way communications that can only be created by a user with a Teacher account.
To access your course, go to the My Courses page and click on the icon representing your course. That will take you to the course dashboard.
Open the Course Menu by clicking the menu icon (three horizontal lines).
Click Announcements in the menu. That will take you to a list of all existing announcements.
If you are an educator, you will see a + icon in the top-right corner. Click that icon in order to post a new announcement.
Once you've opened your course dashboard, click on Announcements in the lefthand menu. You will now see a list of all existing announcements. Educators will see a Create+ button for posting new announcements.