l can not figure it out and l can not find it in my owner is manual!

always on the fender well within arms reach of open hood look down most are on left looking down at it or on right side of car siting in it will have a flip top most likely only thing that does most of time plastic more than likely beside the over flow jug

It is the same as the front fluid reservoir. If you are not getting fluid to the back, you have a clog somewhere or the motor to the back is bad.

There is not a separate reservoir for the rear. Check the rear nozzle and make sure it is not clogged. If it is, you should be able to use a safety pin to unclog it.