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View the video

Some folks said they had a problem following the video so here are a few photos that will hopefully explain how to tie this useful knot
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Pass the line through the eye of the fly and form a loop with a fairly generous tag end.
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Pinch the tag end and line between your fingers. Insert your forceps through the loop.
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Using the forceps, rotate the fly 3 to 5 times. Due to the thickness of the line I used for this demonstration, I only went twice around the line.
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Grab the tag end with your forceps.
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Pull the tag end of the line through the loop.
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Pull and tighten the knot. A little natural lubrication will help snug the knot down.