Make sure the emulator screen is active by clicking into it.

Save state
  1. To save your game progress, move your mouse to the bottom of the game screen, some icons will appear, click on the save icon:
    (arrow pointing down)
    Save game button
  2. Download the file with your desired title and keep the file anywhere on your computer. Make sure that the file name has the extention specified in the dialog that opens.
Load state
  1. You can load a game clicking the load icon
    (arrow pointing up)
    Load game button
  2. Find the save file that you saved previously. Open this file and your game will load, allowing you to continue playing the game without loosing any progress.