parking

Newb here, trying to install a stereo for my son's old Elantra. I have the stereo in, microphone, etc. (it's a CarPlay compatible unit). The one instruction I can't yet solve, and have been scouring the internet for is the part where I am supposed to connect a green wire to a parking brake...

my car is a 1990 Honda CRX Si, and it has a Clifford Arrow II alarm system, which a shop installed back in 1999. the alarm works fine except one problem that has to do with the feature that flashes the parking lights....... sometimes after arming or disarming, the parking lights get...