Hi my name is Paolo and i write from Italy ... Sorry formy bad englis and for any error

Yesterday I tried, following the instruction of this video https://youtu.be/3TTQszhomhk , to activate the secret function of android6.0, but I have a problem, even if the icon's picture of settings menu is changed, that indicate the procedure is successful, inside settings menu does not appears the new secret submenu ... someone can tell me if it is a problem of mashmellow version installed or depends on the phone?

Me too, unfortunately ....i would like to unlock SYSTEM UI TURNER functions, but nothing happens apart from the changing of the settings button