You need a slowish shutter speed - 1/40 or 1/60, so that you can get the background to blur. Then you pan the camera at the same speed as the moving object and keep panning as you press the shutter. The only other setting you may need to look at is the focussing - you may need to use manual focus depending on your camera, due to the fact the camera is moving. Ours has a "servo" setting which means it continually adjusts the focussing point.