If this is your first time using Course Reading List in a course, you might need to enable the Course Reading List feature in your Canvas settings.
Login to Canvas
Open your course
Use the left-hand course navigation to find the Settings link
Open the Navigation tab from the top menu
Find Course Reading List in the list of navigation options
If this option says "Page disabled, won't appear in navigation," you will need to enable this feature. Click the three dots at the end of Course Reading List. From the menu that appears, choose Enable
Hit Save to update the course navigation
After Saving the Navigation, the Course Reading List will appear in your Navigation menu