Black, White, and Red wires on new timer switch, but only two black wires in box. Which wires go where?

I am replacing a light switch with a new Utilitech in-wall timer switch. The switch has black, white, red, and green wires. However, the switch I'm replacing only has two black wires (and a ground). The instruction "pamphlet" is useless... It says to wire each wire on the timer switch to its... show more I am replacing a light switch with a new Utilitech in-wall timer switch. The switch has black, white, red, and green wires. However, the switch I'm replacing only has two black wires (and a ground).

The instruction "pamphlet" is useless... It says to wire each wire on the timer switch to its respective colored wire from the box - which I don't have.

How do I wire this? Do I just ignore the red wire on the switch?
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