Just to be clear, this is NOT an "RGB LEDs" cube kit.
There are NOT ~550 RGB LEDs in this kit.
This is a cube with separate blue, green, and red LEDs.
192 blue LEDs,
128 green LEDs,
192 red LEDs.
The video is NOT for this version of the cube, it's for the all blue one.
The sainsmart page for these is here: https://www.sainsmart.com/products/3d-led-light-square-diy-kit
And they do have a wiki instructions page that includes how to load...