To Assign F And M Buttons - JLCooper Electronics MCS-3800 User's Reference Manual

To Assign an F or M Button
Since the F and the M buttons are Shift-able, first check the
state of the Shift button, before entering Assign mode.
That is, if you want to assign F1 only, make sure Shift is off.
If you want to assign the command to be sent when Shift F1 is
pressed, make sure Shift is on.
Press Assign to enter Assign mode. The yellow LED is lit.
After entering Assign mode, pressing an F or M Button will
select that control for editing.
At that point, the display "holds" the currently selected control.
If you change your mind and wish to edit a different control
instead, press Assign to exit assign mode. Press Assign again to
re-enter Assign mode and select a different control.
Use the LCD and rotary encoder knobs to edit the control.
Turn the right-most encoder knob to reveal additional editable
parameters.
After making the edit, press Enter on the Keypad to store the
changes to memory.
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