If you are having trouble scrolling using a mouse wheel just simply click on the up or down arrows on the scroll bar or click on the bar and drag. If you mean you cant use your mouse by clicking as above then simply use the up or down arrows on your key board.
How do I change my screen from scrolling down with the mouse to using the bar at the side of the screen. I now get a wave effect instead of the normal default when I scroll down a page with the mouse. Can anybody help !