There are two ways to access the Gradebook.

You can access the Gradebook for a specific course from the Course Navigation menu in that course.
You can also access the Gradebooks for all of your current Canvas courses from the Global Navigation menu from any page in Canvas.

Accessing Gradebook from within a Canvas course

You can access the Gradebook for a course from the Course Navigation menu to the left of your screen within that course by clicking on Grades

Accessing Gradebook from the Global Navigation menu

To access Gradebook from any page in Canvas you can click on Grades in the Global Navigation menu at the top of your screen.

You will see a list of all of your current Canvas courses. Click on a course name to view the Gradebook for a particular course.

As the semester progresses and you enter grades for assignments, a running average grade for each class will replace the "no grades" placeholder in this list.