Installing Corsair RGB Strips and NZXT USB Header Expansion

[GBDesu]

My motherboard on my PC has all USB 2.0 headers filled, so I bought an NZXT USB Header Expansion so I can install my Corsair RGB Strips. I'm not very familiar with how molex cables work, but the USB expansion requires a 2-pin molex connection to power it. The instructions say it has to be connected to the PSU, but I don't see any female molex cables that directly connect to a SATA or peripheral port to my PSU sold to consumers. I'm not sure how to properly install this expansion hub, and I was wondering if anybody knew how.

 

My motherboard is an MSI MPG Z390 Gaming Pro Carbon AC. The JUSB3 and JUSB4 are filled. Also a side question: anybody figured out what the 5-pin JT1 is for? 

 

NOTE: The JCORSAIR port for some reason does not work with my RGB strips. Not sure if my BIOS require an update or if the function is not longer available.