Click on the "Menu" button in the bottom left corner and it will take you to the "Save Game" screen. If you are not seeing the Menu button, check the screen setting. If your screen size is not set correctly (600 x 800) or if your screen has limitations, you may not be seeing the entire menu bar or a student may have collapsed the tool bar at the bottom of the game.
In version 2.0, you may also select the "Save As" button if you wish to save this game where it is. This is helpful if students are beginning a complex section of a game, and may want to "do it over." They can come back to the game they saved under another name and it will open at that earlier saved point.