When your refill bottle connects to your Kuvée bottle two things will happen. First you'll hear the bottle click in to secure in place. Second you'll see the label of the wine appear on the touchscreen. Once this happens, you know you are good to start pouring.
If this is the first time you are using this refill bottle make sure the screw cap is removed and that the foil tab on the refill bottle's neck has been punctured or peeled off. Don't throw away the cap though, you'll want to place it back on the refill bottle once you remove it from your Kuvée bottle after pouring.