You can check your app location permission settings in your iOS device settings. This is separate from the HappyCow app.
Once in your iOS settings, you should see a location permission setting that you can toggle on for HappyCow.
If your iOS Settings app isn't displaying this, then please follow these steps:
1. Uninstall the HappyCow app
2. Restart your device
3. Reinstall the HappyCow app and make certain to allow location when prompted while installing
Let us know if you still have difficulty after following the aforementioned steps.