I am replacing a valve in a 10 year old goodman furnace. The old valve has an orange lead in going to the "m" terminal and blue and green leads going to the "c" terminalfor a total of three leads . The new valve only has two terminals . How can I connect the new valve
thomdunkneedshelp

You have the wrong valve I believe. Take it back where you got it and tell them you need the 3 wire one. They are different. You might also take the model number of the furnace with you so there will be no more mistakes.