I'll tell you how the Artifitial and natural work.
Little hard to explain just by typing though.

Natural-

Gently touch either the 3,5,7,9,12 fret,of any string, any of the position markers will do, a pick very lightly while at the same time lifting your finger off of the string. REmeber touch the string, don't press the string to the fretboard.

In the 12 fret harmonic, the two octives HARMONIZE and make the sound of the fret where your finger touched, and that goes for all of them.

It takes time but you'll figure it out.

Artifital Harmonic-

THese are really hard to explain just by writing.

Say for instance you fret the 5 fret.

With your picking hand, take the pick and position it with your thumb and middle fingers.LIne you thumb and middle fingers perfectly with your index.

Using your index finger, touch the 17 fret, don't touch the string to the fretboard, just touch the string at the 17 fret.

THen with your thumb/middle fingers (the ones that are holding the pick) pick the string behind your index finger that is touching the string at the 17 fret, just remember to let off of the string as soon as you pick

THis is the best I can explain it without talking to you face to face.
Hope it helps, but if it doesn't, you'll have to get some one that knows the technique to show you face to face.