Download and install the Downloader app from the Amazon Fire TV App Store.
Using the built-in browser (found in the side menu) of the Downloader app visit https://mobishacktv.com/downloads.php and click the download button. The APK file for the latest version of the MobiShack TV app should then begin downloading.
Once downloaded, install the APK file to your Fire TV device.
NOTE: You may need to enable the installation of Apps from Unknown Sources on your Amazon Fire TV device before you'll be able to install the APK file for the MobiShack TV app. For instructions on how to do this please click here.