How to use the noose (Hitman 2)

How to use the noose, I'm the Hitman last time you played a million years ago when they are still on discs came out and CDs were relevant,
as I remember those parts, took the noose pressed the button he pulled and you can quietly kill
like in Hitman 2 is to do it, I chose the noose and standing like an idiot behind the enemy press the button and nothing