Hold up your coloured butterfly and line it up, then take the photo
The map shows you where you are and how far you have to walk to the next stop, and it unlocks each one as you arrive. None of that works until this phone will share your location. You can still open any stop by tapping it on the map, but you will be walking blind.
The butterflies fly around you through your camera, so we need it switched on. Here's how to turn it back on.