Just load the file and call the module ghost(...). A complete parameterset you will find at the end of the example.

// module ghost(headradius, headheight, headthickness, eyesize,
// eyedistance, eyeheight, nosesize, noseheight, mouthsize,
// mouthheight, mood)
//
// headradius: thickness of the complete ghost
// headheight: the height of the cylinder without the sphere,
// for complete height add headradius
// headthickness: the ghost is hollow, you can define the thickness
// of the walls
// eyesize: how big are the eyes
// eyedistance: how far away from the center do you want to
// position the eye
// eyeheight: how high - measured from the bottom -
// do you want to position the eyes
// nosesize: how big is the nose
// noseheight: how high - measured from the bottom -
// do you want to position the nose
// mouthsize: how big is the mouth
// mouthheight: how high - measured from the bottom -
// do you want to position the mouth
// mood: 0 - for saying "Ohhh"
// 1 - for happiness
// 2 - for sadness