Mount your digital camera on a tripod
depending on what kinda picture you are taking, with night time lights car headlight trails Set your shutter speed to more then 2 seconds, this differs from different manufactures. Consult your instructional booklet for more information on setting the camera modes. Experiment with the different settings and choose one that you like.
if you dont have a shutter release use the self timer on the camera
Take the Picture
thats it in its basic set up, I am sure someone will come along with a more detailed explanation