That in particular I do not know, but those of Peugeot, Citroen and Fiat have a plastic breathing above you remove and previously emptied by the lowest screw. You put this amount that the manufacturer marks the boxes that I tell you carry 2 liters valvulina.
The emptying cap of the gearbox is at the lowest point of the box, looking to the left wheel, is a hexagonal key screw.
The filling cap is located in the middle part of the gearbox, looking towards the front of the vehicle, looking towards the refrigeration radiator. It is also a hexagonal key screw, I think I remember that with a key 17. The oil level is what you give you.