Build a Simple HMS Countdown Timer on an Arduino to be displayed on a Dot Matrix. Controlled by an IR Blaster

I am trying to build a simple countdown timer that will use this code: [login to view URL] And then will be displayed to these 16 x 32 Dot Matrix LED: [login to view URL] My problem is that I can not understand how to display what I am outputting in the serial monitor to the Dot Matrix.