With the University’s Canvas system, you will be automatically set up if you’re enrolled in the class. You can’t sign up manually.
If you’re having a problem enrolling (or getting into Canvas) – it might take a few days after enrolling for things to transfer to Canvas.
If you can’t get access to Canvas, don’t worry if your first Quiz is a little late. More importantly, you need Canvas access for the readings. If you can’t get them that way, here’s an alternate: