parameter does not exist in concroller

I’m trying to make my walk animation work, currently, I have an arrow I connected between any state and my run left animation, when I press it this is what isee


what do I do to make it look like this[176559-לכידה2.png|176559]

You need to add the parameter in the controller like this Unity - Manual: Animation Parameters and then you can set it from code using animator.SetFloat("Horizontal", 0.5f); where animator is a reference to your animator controller and you can place any value you want instead of 0.5f