As an instructor, you can update the Navigation Bar in your Canvas course.
Open Settings

In course Navigation, click the Settings Link.
Navigation

In course Settings, click the Navigation tab.
Drag and Drop

In course Navigation Tab, drag and drop the item you wish to add from the disabled pages list to the course navigation list above.
Save and Publish
In course Navigation Tab, click save and you should have the chosen item added to your Navigation Bar.

To remove items, simply drag them from the enabled items to the disabled items in the Navigation tab in the Course Settings and hit Save.