How to wire a timer switch?

I am changing a regular on/off switch with a Legrand 7 Button timer switch. Its going to a flourescent light in my closet and the switch is rated for a flourescent fixture. I see the hot wire (black), a neutral (white), a ground (green), and a red wire that says "load". What do I do with this red wire???
Update: In the box I only have a black, a white and green wire.
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