Changing from 3 prong to 4 prong
The red and the black are interchangeable, they are your hot wires, but the white must go on the white that is your neutral wire. Let me explain the green wire. That is your ground. In the past the dryer would use the neutral as its grounding means if something in the dryer ever shorted out (which is a very unsafe situation), so now they decided to separate the wires and have that green wire as the ground wire which is also why there is a 4th prong on your plug. So to hook that up you need to remove the jumper that may be going from the neutral bar to the frame. There is usually a terminal for that ground wire, but if there is not you need to attach that green wire to the frame of the dryer (metal screws usually do the trick, you can also use a screw and bolt if you can find a piece of frame inside the wiring compartment).
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