According to the MAX30001 data sheet, the "Benefits and Features" section indicates, "High DC Offset Range of ±650mV (1.8V, typ) allows to be used with wide variety electrodes"
Because the electrode itself has a very limited number of uses (1 or 2) they are not included in the EVKit/System, and it is expected the user provides these.
One suggestion for electrodes is the 3M Red Dot electrodes available for sale through Amazon.