One of the best apps for Kindle Fire is Easy Installer, an installer program that can help you sideload apps onto your Kindle Fire when they aren't available to download directly from the Amazon Appstore. But how do you do it?

These instructions are specifically verified for installing an APK file onto a Kindle Fire HDX using the free app Easy Installer for assistance.

1. First, you'll need the apps you want to install as APK files. Sometimes developers make these files available freely online, and sometimes you'll have to get them through other means (such as when someone sends you the file via email or another delivery method). Whatever the case, you can't do much without that APK file. It is the app. These next steps just tell you how to install it.

2. Install an app that will let you sideload apps. For this tutorial, I'll use Easy Installer (free). Another popular choice is ES File Explorer (free).

3. From the home screen, swipe down from the top and select Settings.

4. Select Applications.

5. At the top, toggle on Apps from Unknown Sources, and hit OK when the warning appears (and, you know, read it and make sure you want to go through with this procedure).

6. Connect your Kindle Fire HDX directly to your computer using the USB mini cord.

7. Open a Windows Explorer window and click on Fire and then Internal storage. Right-click to create a new folder, and name it whatever you want, although I'd recommend something along the lines of "External Apps" or "Sideloaded Apps."

8. Drag the APK file into your new folder.

9. Launch Easy Installer. Click in the upper right corner and select Scan Apps.

10. Your app(s) should appear. Press and hold the app you want to install until an option appears to do so. You'll have to click through a few more screens, and possibly select whether to first scan the app if you have anti-malware apps installed (never a bad idea).

11. Finally, after the Kindle Fire gives you a warning, hit Install on the bottom right, and your app should be all set.