So I'm ready to power up my LEDwiz and I am still confused after reading the directions. Not that they aren't clear, its just that I'm slow

. I am trying to power 26 led buttons with the LEDwiz. I think I have to crimp and wire directly into the computer's power because the USB connection will not be enough. Is that correct? Also, can I daisy chain the grounds into the one ground on the LEDwiz? The power for the LEDwiz is attached to the +5v slot on the LEDwiz right? And do I still need to hook the USB cord to my computer or is that if you are going to make the LEDs change colors or whatever? Here are my photos:
Pic 2 is the wiring coming out the the Computer's Power
Pic 3 is the wiring going into the USB