Samsung MJ17MSTBV - Manual (Page 39)

Menu Description
MagicBright™
MagicBright OSD Menu will be on screen when you press the MagicBright
button.
And then you can choose one of 'Custom/Text/Internet/Entertain' modes
using [up( ) or down( )] button.
Volume
Menu Description
Volume When OSD is not on the screen, push the button to adjust volume.
Source