Turn over to reveal the screws retaining the mains inputs. Nearest to the camera is the brown live (phase) wire.

The blue neutral terminal is hidden by the black switch activation rod. This runs from the outer orange button (unfortunately clipped out of this picture by the ifixit software) down the length of the casing, zigzagging over the terminal, and then at right angles directly down to operate the switch push button.

The rod has a hole over the neutral screw terminal to allow access.

Unscrew both terminals. You may need a set of tweezers or long nose pliers to remove the screw under the black rod. The wires have crimp spade ends to match the screws. There should be no need to remove the cable clamp.