That interior is similar to mine, but those pictures don't show the location of the button.
It is on the dash. Vertically it is below the level of the where the steering wheel attaches to the dash. Horizontally it is between where the steering wheel attaches to the dash and the where the radio is. It is really hard to notice, I had my car a couple months before I even noticed it. It is on the part of the dash that slopes back toward the front of the car. Kinda down by the drivers right knee. There are no symbols on it. There might have been at one time but most of that kinda stuff is worn off on my car.
I attached some edited pictures that might help. I couldn't find any good ones on the internet, but these are the best. It would be easier to see if I had a picture directly looking at the dash and not side views.