I've always wanted to know how to do this every time I try it doesn't sound right what are you supposed to do?
you mean pinch harmonics?
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Find the notes that sound good when you pick them with your thumb behind the pick so it also hits the string...
you'll also need to find the sweetspot when picking the note... i find this generally around the front pickup area.
Its kinda hard to explain like this, sorry.
try the 3rd fret of the e string for starters
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There's a great video lesson on this very site.

That's where I learned how to do it.
there is a really good lesson on here explaining pinch harmonics, the science behind them and how to execute them well. Check that out.