what is the trouble you are having... do you need an explanation of what these terms mean and what they can do for you?... or do you need help on how to set them on the camera?
Aperture = opening of the iris in the lens. Controls the amount of light entering the camera, and also controls depth of field.
Exposure Compensation = specifically telling the camera to automatically attempt to decrease or increase the exposure value ("brightness") of the image when shooting in any type of "auto" mode (i.e. P, S, A) The exposure compensation is basically just underexposing or overexposing an image on purpose. Ideally, 0 is the "well-exposed" setting, and then -1 would be underexposed, while +1 is overexposed.