Here it is.
Step 1: Parts
1 Large Piece of Perforated Circuit Board (I used this one)
1 Pulse Sensor (I got mine at World Maker Faire but you can get yours here or here)
Some Male and Female Headers (I used a three pin female header for the pulse sensor itself)
Step 2: Program.
Basically, set up an LED on digital pin 5 of the Arduino that goes to the ground pin as well. The sensor connects to positive 5 volts (or 3.3 volts if you changed it to work with 3.3 volts),ground and Analog 0.
Leave a comment if something doesn't work.