I wish I could could be 100% sure about this, but I was helped by someone far smarter than me when putting it together. I’m pretty sure we connected the fans to CHA_FAN 1-3 and then another wire was plugged into CPU_FAN. There may have been more but I’m not positive.
My motherboard is the Asus Maximus XI Hero if that helps.
Edit: So after watching a quick video, I'm pretty sure the USB cable was plugged directly into a USB header at the bottom of the mobo.