The app is in both the Apple App Store and the Google Play Store! Click here from your iOS or Android device to download it now. If you are not currently on your device and search in the store later look for the distinctive flok logo -- there are a few apps with similar names.
The app is designed for phones, not tablets (although you may be able to install it on a tablet, the app is not optimized for them). There is no desktop/pc access to the flok app.
Looking for installation instructions? Check out this article instead.