Click on the dancing arrow or the title of the course, the quizzer will come up and you are to answer the 10 multiple choice questions provided, and submit them. There is a quizzer for each chapter but they are available only during the period I am lecturing that chapter. After the chapter is completed that quizzer will no longer be available and cannot be made up. You may earn up to 3 points (to your average) extra credit if you complete all the quizzers and have a perfect score. You of course can earn partial extra credit if you complete only some of the quizzers.
you can check the schedule for changing the quizzer for your subject so you can plan ahead.