How to Play Natural Harmonics on Electric Guitar
Performance:
Instead of pressing a string between the metal strips against the fretboard as when playing regular notes, softly touch it right above the metal strip, the one of the two which is located closer to the bridge, and stroke the string with the picking hand as usual.
After the stroking, immediately take off the finger of the fretting hand out of the string. And you should get a bell like sound:

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Most natural harmonics have higher pitch than a "plain" note played at the same fret:
Natural Harmonic at | Actual Pitch |
---|---|
4th fret | 2 octaves higher |
5th fret | 2 octaves higher |
7th fret | 1 octave higher |
12th fret | the same pitch as with a plain note |
16th fret | 1 octave higher |
24th fret | the same pitch as with a plain note |
Here is a little lick to practice natural harmonics:

In printed guitar tabs natural harmonics notated as:
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In plain text guitar tabs it is marked as a note between the square brackets:
1|----------------
2|----------------
3|-----<12>-------
4|----------------
5|----------------
6|----------------
as well as N.H. characters, or sometimes as a '+' symbol above the lines representing the strings.