Thumbnail - A small impression that may be accustomed to signify your course across your school; it appears to your pupils inside the sidebar with the course curriculum and within the course directory of one's school. We suggest employing a 960x540px JPG or PNG file type for thumbnail. Observe: http://do-my-online-class20752.blogoscience.com/2403932/getting-my-do-my-course-to-work