How do I use the broadfork?

https://www.youtube.com/watch?v=5KPW6XKAAfAhttps://www.youtube.com/watch?v=_KzlOSCADwkhttps://www.youtube.com/watch?v=Df9LihEsQLchttps://www.youtube.com/watch?v=_QQ-eDVBZ6I&feature=emb_logohttps://www.youtube.com/watch?v=ExvcDqCbflk