After installation, you will see the icon of 'iFound' on your iPhone screen as following:
Tap the 'iFound' icon in the above screen, you'll see this:
Notice your location is displayed at the bottom of the screen.
Now if you want to search for nearby gas stations, just tap 'Gas Station', the search result is showed as below:
Tap the station of your interest to see the address and other information:
Tap 'Display on the Map' shows you the map telling you how to get there. Tap 'Driving Direction' shows you the turn by turn direction in text.