How can I make my sundial funtional?

So now you have a sundial in your garden and you thought you might as well know how to use it. Well good for you, it's really quite simple. Basically there are two components to a sundial: the plate, and the shadow arm that rises out of the center at an angle. This arm captures the shadow of the sun to tell what time it is. Now for the sundial to work, at high noon put a compass down on the face plate and rotate the face plate until the arm faces due north.There should be no shadow. Make sure the plate stays flat and secure and you have a reliable garden timepiece