User Name and Password are only required if the public cannot view the calendar, or you want to display a calendar the default public user does not have permission to.
Date-Time Format is used when an event with a date and time is displayed. Date Format and Time Format are individually controlled by Settings | General.
Skip Resource Types By default, all resources assigned to an event are displayed. You can
Disable Caching By default, the plugin caches generated data for seconds. Caching the data makes your web site go faster and gives your users a better experience. If you edit your calendar, changes might not show up immediately. You can temporarily disable this by checking the box and saving.