Tapping to bach

Hi again.

When I'm doing this bach song:
http://www.guitartricks.com/lesson.php?input=4636&s_id=333

How do I do the tapping? to I tap the 4th with my right, then the 12th with my left, etc. or should I hold the 12th fret, tap the 14th, and pull off so the 12th sounds?

i dont really see what ur trying to do but i think i do
with ur left hand ur going to put ur index finger on the 2nd to the highest string on the 4th fret and then hammer on the 7th fret with ur pinky and then after that u could tap the 12th fret with ur right index finger.