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huh? :s

When you are playing, do a lot of listening. Think about where you feel it would sound really cool. Trust your instincts. Listen to recordings of those that you like using this technique. See how they apply it. It can be tough working in a new technique to your music. Slow it down to where you feel comfortable playing it, then practice at that speed until you can speed it up mistake free. Do the reps, it'll come.

A lower action seems to work well for me for slapping and tapping but I prefer my action to be a little higher for poppin and general play.

Good luck. Have fun.

Like where in a song? where ever you want to add a little more flare, like at the end of a (musical) phrase, like that the end of a verse or something. I'd recommend listening to victor wooten, a number of bassists have told me that he's like the best bassist ever. Listen to different stuff, and you'll get the idea.