How do I use the keypad on my Mentor MP DC drive?

The left and right arrow keys on the joypad will move you through the menus/headers.  The up and down arrow keys on the joypad will move you through the parameters of the menu/header you are currently on. 

The mode button (black button with an M on it) will cycle you through the display modes – parameter view, parameter edit, and status screen.  When an item is blinking on the screen, the arrows will allow you to edit the value.