Permission The only permission required to modify the display method of the days is being OP. Commands /daycounter - give you a sub commands list. /daycounter days - send you the number of days in the chat. OP Command: /daycounter setdisplay <actionbar|scoreboard> <true|false> - display the number of days in the selected area.
Config.yml The config.yml (located in the plugin's folder) only contain the state of the actionbar message and scoreboard. Default state: scoreboard: false actionbar: false