Going way back, the Orlons had a hit record with “The Wah-Watusi”. The lyrics refer to a dance by that name, but I don’t recall ever seeing it at the time or seeing a video that resembles what the lyrics suggest - “… baby when you do the twist, never ever do you get yourself kissed …”, “… when you do the fly, your arms are wasted waving in the sky …”, and " …, the dance made-a for romance …"
Was there an actual dance or dance steps for this song?
But those lyrics you quoted - those are not the Watusi. The first two warn you that the Twist and the Fly are not hip dances and won’t make you popular. The last suggests that doing the Watusi instead can augment your romantic life. There’s no instructional content in the song - you’re going to have to look elsewhere for that.
I’m not sure about the steps - I assumed it was inspired by a particular African dance, but that could be wrong.