As said by Elizabeth Terlinden , it depends on what you plan to do. In an electrochemical cell, oxidation at the anode and reduction at the cathode . Let us know what you want to do...
for a 2-electrode electrochemical system, I would suggest connecting one electrode to the Reference and the Counter Electrode connections, and the second electrode to the Working Electrode connection.
This system is not applicable to a "traditional" three-electrode potentiostat (with Reference Electrode, Counter Electrode and Working Electrode). The connection of the Reference Electrode to a potentiostat has a high input impedance and it does not allow more than a very few current and the connection of the Reference Electrode only serves to detect the potential. The system requires the presence of the Counter Electrode to provide the current measurement.