I want to instal two thermostat in my home I know how to wire one thermostat my houe has two level and the t-stat is down stair and I want to to control it at the second level if any one can helpme I will apriciated

If you are wanting to install two tstats to one system, I would rethink . To make it more comfy on one floor it is going to be very un-comfy on the first floor unless you have a zoning device installed when the equipment is running its going to feed both floors at the same time, maybe I`m misunderstanding you question

I can't understand the question either. Is it?

1) I want to control the temperature from 2 locations, but I want the sensor downstairs.
2) I want to control the temperature downstairs from upstairs.
3) I'd like to be able to switch what thermostat is controlling the temperature?
4) I'd like to implement zoning, so the temperature control is independent.
5) Or something else.

(2) is easy.