MF120 Halo2 and my B450m/ac motherboard

I am trying to install 3 MF120 Halo2 fans onto my PC but I don't really get it. The old and dying fans I got right now are Skytech with this written: 12025L 12H DC12V

How do I swap ou the fans and where do I plug it in? My current fans use the Pata from my PSU but I am unsure if that is accurate. I have 1 RGB Header and ADDR Led Header