The M-Play represent the Sub Bank and not Main Bank. so make sure to add an M-Play Status window in one of your view.
The M-Play ID should be set to Zero, set this in menu>System>DMX setting, select the M-Play and set ID to 0
To change the right side keypad of mode, Hold Select and press the + or - on the right side.
It will toggle between Playback Function and Keypad.