Getting started.
http://pulsesensor.com/pages/code-and-guide
https://github.com/WorldFamousElectronics/PulseSensor_Amped_Arduino
Download ZIP on this page:
Take the PulseSensor_Amped_Arduino-master.zip file, and move it to your Documents/Arduino folder.
Unzip PulseSensor_Amped_Arduino-master.zip in your Documents/Arduino folder.
This properly installs your files
HBS Connections to Arduino
Blue GND
Green +5V
Yellow A0
https://processing.org/download/
Overall page describing the visualization.
http://pulsesensor.com/pages/processing-visualization
Code is in github
https://github.com/WorldFamousElectronics/PulseSensor_Amped_Processing_Visualizer