I can't find a question like this, but I might not be using the right terms. I am in the US. I need to add a double outlet to an existing circuit. I have all the wires in place, but I don't know how to wire it up. Below is my diagram of what I want
The diagram also shows the plugs positions to each other. I can't run a wire from the new outlet, to the far right one. I have the new wire in the wall, with a new double outlet box in place.
The grounds are bare copper wires.
How can I wire in the double outlet off the single outlet in the wall?