Took me forever to find the extra settings as well. Open your camera to take a picture; in the lower left hand part of the screen look for a icon that looks like a gear, click it, and it will display the settings. Scroll down to find shutter sound. Another useful setting is the Anti-shake; I always leave that on.
P.S. also watch out, it likes to turn the flash on as well; if you are taking pictures and do not want to advertise it, turn your flash off.