For the button object, to modify its aspect, you can check the "Styling button object" paragraph in its manual article : scirra.com/manual/111/button
As for the "not working" part, in your event sheet, do you have an event "Button: On clicked" ? If you are trying to use something like, "Touch: On object touched" this will indeed not work, button have their own input events.
If that's not it, consider posting your project and giving details on what you are exactly trying to achieve, what you have done/how you expect your current project to act, what you actually experience it doing.