Many have a mute button: the unmarked, flat, square buttons at the edges of screen, usually 2nd on top right. If not that one, try the others; not like you will

Many have a mute button: the unmarked, flat, square buttons at the edges of screen, usually 2nd on top right. If not that one, try the others; not like you will break it. Some newer designs have hidden it somewhere or removed it.