Help with alarm wiring diagram

[Demongrowl]

I plan on installing this alarm along with two power door acctuators this weekend. I think I understand everything, except for the highlighted part of the attatched diagram. Please someone help. I have a 2003 cavalier coupe. Also, that part that says to hook up to the flash light led, can i hook that up to my headlights or blinkers? so they flash when it turns on, and if so, where do i hook into that?
Thanks

Edit: I do have the Haines repair manual and a wireing chart for my model/year car