Now take the ECG electrodes and stick the green one to the prepared site on your left lower rib area, and the yellow one to the prepared site just below your right collarbone.

 

Insert the plugs of these electrodes in the ECG sockets on the underside of the headbox as shown in the image (don't worry about which goes in the left or right ECG sockets – they are interchangeable).

 

Now take the ‘Ground’ electrode and stick it down to the prepared site on the back of the neck/shoulder.

 

Insert the plug into the ‘GND’ slot in the centre of the top of the headbox.