In the navbar (Navigation Bar where you see Home, Forums etc) you see What’s New the counter in red with white letters is the posts you still need to read. You can press What’s New and you will see what you still need to read in bold, the number is the posts not threads that you need to read. But what if you are not interested in the remainder of the posts wel thats easy, press in navbar Forums below it you will see “Mark forums read” when you press that a warning pop-up with a message to confirm. When you confirm the What’s new is reseted to zero and the counter starts counting again.