disabled (no hands) can i use a mouse to scroll on macbook air ios 8
user is a disabled person (lost both hands) --- i bought him a refurbished macbook air 11" released 2014, with ios 8, yosemite browser. he uses a mouse to operate his old computer, can also use a stylus i.e. to operate an ipad. how can he scroll on new macbook air using a mouse? there are no arrows for up/down or previous page commands.
MacBook Air (11-inch, Early 2014), iOS 8, yosemite