Once you are in the Dashboard, you can add, remove or manage your widgets. On the left side list, choose a Group of Screens you are managing at the moment.
Once selected, please go ahead and navigate to the Playlist you want to manage and navigate to its widgets.
On the right side, you have a list of available widgets that you can add, move, set their timers or remove.
Once you perform any actions to the widget, those actions are automatically saved, and once the playlist finishes, all the changes will be applied and played on your screen.