How do I turn on Forum tracking?
Navigate to your profile (scroll down to the bottom of any Moodle page and click on your name). Then you can go under the Settings bloc on the left and click Edit profile. The setting you want to change on this page is called Forum tracking and you want this set to "Yes: highlight new posts for me". This will then let you know how many forum messages you still have not read. If your Teacher has turned this off under a particular Forum, this will not work.