Once you are logged in, from the Home page, click on a Unit, then click on the "Take Lesson" button. It will guide you through a series of words sharing the Pinyin for each. Be sure to have your sound turned on as it will pronouce each word for you.
Once you are logged in, from the Home page, click on a Unit, then click on the "Quizzes" button. There are 5 types of quizzes. Select one of them to get started. You will then be asked a question for each word in the lesson. There will be 5 choices for each question. Choose the best answer with a mouse click or with your finger on touch-screen devices. If you get it right, it will turn green. If not, it will turn red and you must try again.