Can someone please explain how the horsemen of the oppocolypse and how they play in with the rapture and the s?

There's no such thing as the four horsemen of the apocalypse. It's just a story. The Revelation of St. John the Divine is most likely the product of a psychotic who was hallucinating because he was out in the desert and starving. Sensory deprivation can seriously mess with your mind and make you see things that aren't real. The Revelation should never have been included in the Christian Bible. It tends to attract people with serious delusions and mental problems, and they become obsessed with the end of the world. It definitely does more harm than good.