Navigator PRO - Powerful Android GPS Navigation System with Offline Maps - How to use it?

1 - How to download maps?
2 - How to see points of interest on the map?
3 - How to download and install voice guidance?
4 - How to change the language of the app?
5 - How to enable GPS module and find my position?
6 - How to find points of interest and add favourites?
7 - How to find an address?
8 - How to start the navigation?