There are many different reader applications available. Before downloading one, read the description thoroughly to make sure that it can open ePubs. Also check the price. Some require you to pay, while others are free. Some frequently used reader apps include:  Aldiko: http://slideme.org/application/aldiko  Calibre: http://calibre-ebook.com/  Mantano Dropbox: https://www.dropbox.com/android  Nook: http://slideme.org/application/nook  FBReader: http://fbreader.org/FBReaderJ  Kobo: http://www.freewarelovers.com/android/app/kobo  OverDrive: http://omc.overdrive.com/  Laputu: http://slideme.org/application/laputa-0 You can download the reader app to your computer and drag the installation file over to your Kindle Fire later.  Visit the download page for whichever reader app you choose. Follow the on-screen instructions to download the app. Plug your Kindle Fire into your computer by using a USB cable. Drag the downloaded file over to a dropbox folder within your file explorer on the device. If you download the application to your computer, you could also e-mail yourself the app and download it to your device that way.  Follow the download instructions for your chosen reader app. Open your e-mail composer on your computer. Attach the file to a new e-mail and send it to your own e-mail address. Open your e-mail using the Web browser on your Kindle Fire. Download the attachment you sent yourself. One of the most direct ways to get a reader app is simply to download it to your Kindle Fire without using your computer at all. Use the Web browser on your device to navigate to the download page of your chosen reader app. Follow the on-screen instructions to download the app. Once the app finishes downloading, a screen should appear asking you if you would like to install it.  Confirm the installation on this screen and follow the instructions to complete the process. If this screen does not appear, hit the name of your Kindle in the menu bar to search for the app you downloaded. Tap the name of the app to open the...

TL;DR in Chinese:
搜索免费的阅读器应用程序。 通过计算机加载应用程序。 将应用程序E-mail给自己。 直接将应用程序下载到Kindle Fire。 安装应用程序。