1) Press the MENU button

2) Press button 25. RP SETUP

3) Use the F1 knob to select "4. ENABLE BUTTON"

4) Make sure the option is selected for "ACTIVE", otherwise use the F2 knob to change it.

5) Now use the F1 knob to select "5. MENU CONTROL".

6) Make sure the option is selected for "ACTIVE", otherwise use the F2 knob to change it.