Since the Settings window for the cMT-FHD does not have an option to enable the VNC server, you can do it with a System Bit in the HMI. LB-12092 is used to enable/disable the VNC server. LB-12093 is used to select single-connection or multi-connection (OFF=single; ON=multi). You could place a Toggle Switch on a window to manually enable/disable VNC, or use a Set Bit object on the Common Window (Window 4) to enable it when the HMI starts up.
Note: LB-12092 must be turned OFF before LB-12093 can be toggled ON or OFF.
You can set the VNC password in the System Parameters > Remote tab.
You can also use LW-9530 through LW-9533 to display or change the VNC login password. Use an ASCII Object assigned to LW-9530, configured for four words.