Hi Samy,
If you are following along with the exercise about adding the driver, then you don’t want to add an animation key frame. You want to add a driver, (which will then show up in the window on the right hand side)
However, If you are undertaking the other exercises that use animation (and not a driver) then you want to change the window on the right hand side to show the animation data and not the driver data.
Those windows look very similar but they show different data.
Hope that makes sense.