If you'd watched the video you would have had all those questions answered.... To scroll just move your finger around the top of the mouse to go in any direction. Left click just click the top left where the button normally would be, same for right click. To go back / forward just slide two fingers left or right across the top of the mouse. What have you ever used a middle mouse button for? And I'm not taking the mickey, I'm genuinely curious as I use computers all day, every day and I have never found any use for a middle button.