You can obtain a street address directly from the LocationSensor (CurrentAddress) where this is based on your device's present latitude and longitude. You cannot obtain address information from an arbitrary latitude / longitude pair with Blocks. The LocationSensor can provide a CurrentAddress from the user's actual location .
Alternatively, there are web pages that can convert a latitude/longitude into an address. You might be able to use the Web component to capture the information this way. I don't know if it is possible (never tried). Here are several:
ONLINECONVERTERS
What you do to get an address depends on the source of your latitude and longitude information. It is very easy to get a latitude and longitude from an address (use the LatitudeFromAddress and LongitudeFromAddress blocks of the LocationSensor) butthe reverse is only possible by using LocationSensor coordinates with the CurrentAddress block if you only use Blocks.
Regards,