Make sure that the option "Unknown Sources" is enabled in your settings, so you can install the app without any problems.
Visit the main page www.clashofphoenix.com and scroll down until you see the server selection.
Select the server you want to play on. To do this click on "Learn More". You will be redirected to another page.
Scroll down and click on "Download". You will be redirected to another page.
At the new page you will see another button. Click on "Download anyway". Now your download will start. Be sure you have an Android device.
When the download is finished, tap on the downloaded com.clashofphoenix.ccx.apk
A new window will pop-up and ask you if you want to install Clash of Phoenix. Click on "Install". It may take up to one minute to install the game.
When the installation is completed you can tap on "Open" to play the game. You will find it on your home screen or app menu later.