To enable closed captions on the HD set top you must access the On-Screen Menu. Begin by powering ON your HDTV and powering OFF the set top box. Press the MENU button on either your Mediacom remote or the set top box front panel to call up the On-Screen Menu. You may use either the front panel or the remote to navigate the display. Arrow down to the Closed Caption Menu option. Use the right arrow button to select the option to enable closed captions. Press the POWER or MENU button to exit the menu and save your settings.