To see the address of a station before you claim an offer, click on the station on the map and then click on the name of the station at the bottom of the screen. This will bring up a zoomed-in map of where the station is located and the station's full address. This screen will also have a breakdown of the offers available at that station, by fuel grade.
After you have claimed an offer, you can navigate to the station by clicking on the blue arrow icon next to the station's address. The blue arrow icon will bring up your phone's preferred navigation system (GoogleMaps, Maps, Waze, etc.) and direct you to the station.