From your child’s profile page, tap the icon for the grade you wish to update. Tap the Class Photo link at the bottom of the screen. Tap the three dots [...] in the bottom right of the photo, then select Edit, Share or Delete icon. When you select Edit, you change the photo by tapping Change Photo on the bottom left.
>>> IMPORTANT: Deleting a photo cannot be undone. Once you delete a photo it cannot be restored.