Gently lift the black tabs which hold the two ribbon cables connecting the lens assembly to the main logic board using your finger or a plastic spudger.

The lens assembly is held in place solely by the ribbon cables at this point. Once you have removed the ribbons, the entire lens assembly will easily lift free of the rest of the camera.

The lens assembly is a sealed unit and I don't recommend opening it unless you have a clean room or don't plan to use the camera again. The pieces inside are very tiny and sensitive to any dust. If it's damaged, it's best to replace this component.

To access the CCD, remove the two small Phillips screws indicated by the green circles. If there are any dark spots in pictures, this can often be caused by dust on the CCD. Cleaning it can often help to resolve these issues. Again, you only want to do this in an extremely clean environment.