What Motherboard does it have? If you can identify the motherboard model then you can download the manual form the manufactures website. It would usually be a 4-pin header labeled as 'RGB_HEADER' if it has one.
Maybe someone here already knows the motherboard it has ?
Then it has a single RGB header at the top
[Header is for RGB LED Strips and supports 5050 RGB multi-color LED strips (12V/G/R/B), with a maximum power rating of 3A (12V) and no longer than 3m.]
It does not have an addressable RGB header.