Use the cable with the connectors (female/female) and plug it to the “IN”
Use the cable with the connectors (male/female) and plug the female connector to the “OUT”.
Install the TTC-SC02 speed controller into a 5 1/4” bay
Use the cable that just plugged to the “IN”, and connect it to a 3-pin motherboard fan header
Use the cable that just plugged to the “OUT”, and connect the cable to your fan