How to turn off shutter sound in camera?

If Mute doesn't work try holding the lower volume button down until it Mutes. If this doesn't work you have to live with the shutter sound for reasons already explained. Be sure to lower the volume before turning on the Camera. When in Camera the volume switch can be used to take pictures.

A number of countries don't allow cameras to be silent, if turning the volume down and muting notification sounds hasn't made the camera silent then that implies that you are in a country where it isn't allowed

Great question! At the bottom of your iPad screen, slide your finger (from the bottom) for an invisible menu to appear. There is a hidden navigation bar with an airplane logo, sounds, lock, camera, timer, etc. Click the 'mute' symbol.