Enter the longitude and latitude in digital format; e.g.: 26.482850
Use Google Earth to find lat-long of a location, or use one of the following links to do so: Convert lat-long to digital here or here).
You can also search for the location in Google Maps: enter the search point or address and then right click on the location icon and choose "What's here? The lat-long will be displayed and can be copy-pasted into the fields below.