You are not looking for a hardware feature of the DE0 board, you are exclusively talking about functions that have to be created in your VHDL or Verilog (or may be schematic) hardware description.
There are also switches on the DE0 board, so you should find a way to make the intended input. You could also make the display changing periodically without user interaction.
Your question suggests that you managed to run a design example on your board, but don't actually understand how it works.