Each week you should attempt two quizzes - one for each strand of the course; FP is due 12.00 on Wednesdays, and CL is due 12.00 on Saturdays.
It's important to note that: you have 30 minutes (wall clock time - the time keeps running if you go away) to do the quiz once you start. Once you've answered a question, you can't go back to it. (Why? Because the quiz is a quick check (not a quickcheck) on your understanding, and we don't want you wasting time trying to get an extra 1/6 mark.) It shouldn't take more than 10 minutes, and usually less than 5 minutes.
The answers become available once the deadline has passed. The quiz remains visible until the following Thursday.
After the deadline, you can ask on Piazza about anything you don't understand. Not before!