The document provides instructions for changing a Facebook cover photo and profile picture. It states that a cover photo should be 851 x 315 pixels or 11.35 x 4.2 inches in size, while a profile picture should be 180 x 180 pixels. The instructions note that to change a cover photo, one should go to their timeline, click "Add a Cover", select or upload a new photo, reposition it if desired, and click "Save Changes".