Input Username/Password you used when you placed your subscription order.
Buy Pro (Don’t Worry its free) use same email and password for legends.
Settings >>>Player >>>Hardware decode
You’re all set!
AMAZON FIRE TV SETUP GUIDE
FIRE TV STICK
First check to make sure you firestick will allow Sideloading!
From the Home Screen go to Settings > MyFireTV > Developer Options > and turn both debugging & Unknown Sources “ON” (NEW 2020 FIRESTICKS YOU WILL NEED TO ENABLE UNKNOWN SOURCES ON EACH INSTALLED APP INDIVIDUALLY) after that follow the instructions below..
Ask Alexa to open the Downloader App on your device