Are you using the Jubilee, Saved, Maranatha, or Exodus themes on your MereChurch website? If so, you are using the Church Content Pro plugin, which is a custom-built plugin tailored to these themes. Church Content Pro manages your sermons, your events calendar, your staff members, and your campuses (if applicable).
ChurchThemes, the creators of this plugin, have an excellent online documentation. You can refer to their articles for help using their product.