Fig 1: Adding a POI
Under Overlays - Add POIs you open a menu to add POIs.
You can add multiple POIs with an excel spreadsheet, attached to this article. Make sure to fill the title cell, the category and subcategory cells, and one location field (either MGRS, UTM or both Latitude and Longitude).
There is also a menu for adding individual Points of Interest. Add the Title, Type and Subtype and Description and a location (Either MGRS, UTM or Latitude and Longitude). If you don't know the exact location, you can right-click on the location on the map and click add POI. This will open the Add POI menu with the location already filled.
Under Overlays - Add Overlay you can upload and categorise Google Earth KML and KMZ files to add as Overlays. You can also draw and save new Overlays, described in the Draw Overlay article.