First, make sure you have it set so you can sideload apps. Swipe down on the home screen and tap More then Device. Then turn on Allow Installation of Applications.
Now download the youtube.apk file to your PC.
After you’ve downloaded the file, connect your Kindle Fire HD tablet to your computer if it isn’t already. When AutoPlay comes up, then click Open Device to View Files, or open it in Computer.
Go to the Download Folder and copy the APK file to it.
Next, install ES File Explorer on the Fire if it isn’t already and open the Download folder.
Tap the YouTube icon and follow the on-screen instructions to install it.
The cool thing about installing YouTube is it will display an icon in Apps, unlike the hidden Camera app.
There you go! You can now enjoy your favorite YouTube videos on the Kindle Fire HD.
Another app not included in the App Store is Dropbox. Check out this article on how to install Dropbox on the Kindle Fire. Installing it on the new Fire HD is essentially the same process. The YouTube Android App doesn’t use Flash to play videos, so Flash isn’t needed on an Android device except in the case where you are web surfing. In fact, Adobe officially stopped supporting Flash on Android as of version 4.1 (jellybean) Thanks for the comment! Unfortunately it requires your device be rooted, which instructions for that are here: https://www.groovypost.com/howto/root-kindle-fire-hd/
