The Message Tab section on HERE wpilib.screenstepslive the Drivers Station Message box New for 2016 - This window will display prints from WPILib and User Code. I been milling through many OLD post on how to use the DriverstaionLCD class that seems not to exists since 2013? What I did find if I place a simple line of code in the program
System.out.println("Hello From the Rio"); //Print to RioLog
this prints to the RioLog witch is grate for debugging. If you select the Option Icon On the Driver Station and check + Prints] these messages are displayed here to. Great to tell you drivers what is going on.