To create a new POI, click New POI. In the right section of the window, specify the POI location. In order to do this, you can use the smart search of POI location - box above the map. Specify the exact position of the point by clicking into the map window (or drag the marker).
You can fill in more details to the left section of the window, e.g. POI title, description, URL address, tags.
Tags can be used to create POI categories. Enter text separated by commas. You can now filter your POIs by tags (eg. Holiday 2014, Hotel).