Quizzes are a feature of the premium Learning Management System (see our Pricing page for further details)
First, you will need to create a quiz through the Quizzes menu.
NOTE: Only Organization accounts have access to the Quizzes menu.
From there, you can click on New Quiz, which will bring up a menu allowing you to create a quiz and put in any number of questions and answers you need.
Once the quiz is created, you can assign it as a resource to a section inside a course lesson. It will be available for your students to complete by going to the Quizzes menu, then clicking Quizzes to take.
Alternatively, you can create a group of students and assign the quiz to that group as a resource from the Users-> Groups Menu.