Terminal block??????

[RRA4LIFE2]

we are a rookie team and need help with this:
in the image below you can see a pwm cable, the picture shows that the red wire is not used and the white goes to the terminal blocks but where does the black ones go to? and why is the white wire of the pwm cables only connected to the negative charge wires and commands 0 and 1 of the rainbow wires? does it matter where we connect the white wires to or does the terminal block conduct the information and feeds it through out the ports or how does that work?

Also where do we connect the power to the terminal block?