You will need to sign into Canvas itself (this is a Community Forum), at which point you will be able to see your classes on the Dashboard. Click on the class you need and find the Grades option on the left side to access your grades for only that class.
You can also sign into Canvas and click on View Grades on the right side of the Dashboard screen to view grades for all classes at once.
If you are unable to sign into Canvas, then make sure you are using the correct portal. Some places have a unique login page for their district/university/etc and searching for Canvas on Google takes you to a general portal that may not recognize your login information.
