This page explains in some detail about native calendar module, which makes use of the excellent, open-source Jevents component. You may have asked us to pipe in your existing calendar solution, such as MyChurchEvents, or Google Calendar, in which case, this section won't apply to you.
To add a new event, simply go to your calendar page, and either click on Add Event found under the calendar itself, or hover over the day you'd like to add the event to, and then click on the little plus sign that will appear in the upper-right hand area of the day in question. A window will pop up with options for you to fill out. When done, click save, and that event will be added to your calendar.