Quiz assignments can be build out of single choice, multiple choice or free text questions. Before you start with the assignment quiz you have to confirm that you are taking the assignments on your own. After that you can click on start and you will be directed to the questions.
The questions in the quiz assignment are following among each other. In contrast to other quiz types you are not able to see, if your answers were wrong or wright until you submitted all of your answers.
You can find the "Submit" button at the bottom of the page.
After you have submitted the questions you can not change anything. So make sure that you answered all the questions before you submit.