How do I install a dimmer switch with 3 wires?

To install a dimmer switch with 3 wires, first turn off the power to the circuit. Connect the ground wire to the green screw on the dimmer switch. Connect the black wire to the wire labeled "hot" on the dimmer switch. Connect the red wire to the wire labeled "load" on the dimmer switch. Secure the wires with wire nuts and install the dimmer switch into the electrical box. Turn the power back on and test the dimmer switch.