Instructions
Turn over the Nintendo Wii and locate the USB ports. These are on the backside of the console near the top.
Attach the USB splitter to one of the two available USB ports.
Attach all four instruments to the USB splitter. The drums, both guitars and the microphone all have USB cables that will fit snugly into the four ports of the splitter, side by side.
Press the "RB" button on both guitars and the drums. This will power them on. The microphone will always be powered on as long as it is attached via USB.