How do I lock and unlock the keypad on the Honeywell T4 Pro?

Press Menu, navigate to LOCK using arrow buttons, then Select. Choose OFF (full access), PART (temperature only), or ON (no access). To unlock a locked keypad, press the center button and enter password '1234' using the arrow buttons to change digits and Select to confirm each digit. If incorrect, the display will flash '--'. Press Back to correct and try again. (Page 5)