To install the EchoLink application on your Kindle Fire, without the official Amazon store, you need to visit and download the APK file from the following website. After you did this, use an application like File Expert (you can download it from the store) to copy the APK file to your Kindle, then disconnect the device from the computer. After you did this, just navigate to the location where you copied the file on your tablet and run it from there to install. If you have any difficulties, you can contact the developer on the official website.