It's talking about a 5 volt ADD header, pretty much used to sync up the RGB lighting effects for the drive. It's literally shown in the pictures on amazon what that looks like:
You don't need it in order for the SSD to function. From what I can find your board does not have a 5v ADD header, I think it does have an RGB header but you'll need a controller with 5V ADD ports to make ti work, it's more work than you should deal with, I would recommend getting a less tacky SSD.
A simple Samsung EVO or Crucial MX500 SSD will be just as fine, if anything they're a...