I can't link the slider (Slider) to the picture in order to increase the size of the picture, how to do it?

Question

Slider

Good morning everyone. There was such a problem. I have 2 options for functions that change the size of the image. The first option is a slider and the second option is just 2 buttons "+ and -" that increase and decrease the picture.
So, what is the problem with the buttons, the picture reacts flawlessly and increases and decreases, but for the slider 0 reactions, how to correctly attach the slider to the picture, plz tell the noob