Fire TV stick: SETTINGS.
go to MY FIRE TV.
go to DEVELOPER OPTIONS.
go to APP FROM UNKNOWN SOURCES – turn it ON.
Go back to Home Button/Screen and install/start the app DOWNLOADER (SIDELOADER) via search function. [You can use voice function to find the app as well]
Enter
APK source URL and once downloaded, press the install button.
e.g. If you want to install
SMART IPTV (SIPTV) App, then use the official
APK SOURCE URL (
http://apk.siptv.app) from APPs Website.
If you need help with setup, feel free to send a PM to me.