I’m sorry the documentantion is not clear in this specific topic, I’ll try to fix it in the future. Meanwhile, at BOM you can find the components and their references. The references are printed directly in the PCB in the places you should solder the components. There is also a electronic schematic of the Control PCB in its Github Repository that you can check.
The wiring diagram on the Electronics documentation is helpful to know how to connect the motors, fans and sensors once you have soldered the PCB.
Hope it helps!