In the first example of Screencast23, our input is from a signal generator not a button, that is why we are not configuring a pullup or pull down resistance. In our Final we are using buttons on our board. Also, these buttons are active low. So do not just follow the Screencast23 example verbatim, make proper adjustments for buttons on our board. It is important to understand Screencasts 20, 21, 22 and 23 before attempting the Final or going to office hours for help.