Dominatorv380

I have an rgb strip from a prebuilt PC that I'd like to put into a new custom build. But here's the thing, it has a female molex connecter on the end, and comes with a male molex to male 3 pin rgb. You can imagine why I can't plug this into a motherboard. Any ideas? Edit: I am not new to pc's but I am a bit new to rgb. It has dawned on me that that isn't a "3 pin RGB" but rather a fan connector.