To connect the GE Z-Wave Wireless Smart Lighting Control Smart Switch for single switch wiring, do the following:
Switch off the power at the fuse box.
Remove the wall plate and the mounting screws.
Remove the switch but keep the wire connections intact.
Match the screw terminals with the wires on the switch.
Label the wires as per earlier connection and then remove the wires from the switch
The GROUND terminal should be connected with the green wire.
The LOAD terminal should be connected with the black wire.
The electrical service panel should be connected with the terminal marked LINE.
The neutral terminal should be connected with the white wire.
Now, insert the switch into the switch box. Make sure that the wires are not crushed or pinched when fitting the switch.
Mount the wall plate and turn ON the fuse box to test the connection.