Instructions
Turn your camera on, set the ISO (light sensitivity) to a low number if you are shooting outdoors. An ISO of 100 is good. Use a medium number for indoors, around 400.
Turn the exposure mode dial to "Shutter priority" this is usually indicated with the letters "S" or "Tv." In shutter priority, the photographer selects the shutter speed and the camera picks the appropriate aperture setting to for a correct exposure.
Turn the input dial to select the shutter speed. The type of object and how fast it is going will dictate the shutter speed you need. For a very fast object like a race car, 1/200 to 1/250th of second will create the effect. However, this shutter speed would be too fast for a similar picture with someone riding a bike, where you would pick a shutter speed around 1/125th of a second. Experiment with the shutter speed until you have the setting that works best for your situation.
Hold the camera up to your eye, then press and hold the shutter release half way down to activate the metering and auto-focus modes. Keep the center of the lens on the same spot on your subject the entire time. This is the most important part to keep the subject sharp and the background blurred.
Press the shutter release as the fast moving object passes in front of you as you move the camera to keep the center of the lens on the same spot. Review the picture you have just shot and make adjustments to the shutter speed as needed.