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Yes! I got it working, thanks. I moved the animation frame advance cursor back to the start, and Merge, then applied a Pose Preset I had of it and now it works. 

I also moved the End marker up much closer to the beginning.

But now the next question: Is there a way to limit the range of movement in a previously made by someone else animation? To me her butt bounces a little too high. Is there a way to restrict the range of upward movement there? 

click on that frame where the butt animation goes to high and then modify the dials that make the animation. 

But where are those animation dials?