Students can only delete announcements within a group. There are a couple of ways to delete an announcement.
Click on the Group you want to access.
Click the Announcements link.
After clicking on the Announcement link, you will be directed to the Announcement page where all the Announcements for the group are located.
Find the Announcement you want to delete. Click the Announcement checkbox [1] and then click the Trash button [2].
Note: You can select multiple announcements to delete them.
A popup window will appear to ask if you are sure you want to delete the announcement. Click the OK button to delete the announcement.