How to install the Gr8 Custom Rom

[Guest Johnsons Computer Service]

I am new to this. I currently have a stock 6.3 kindle fire. I am wanting to install the Gr8 rom. I have d/led the zip file to my pc and to my fire and have it extracted to its own folder. What is the next step to install this rom? I have found a folder with about 20 diff .apk files but I am unsure as to which ones i should install. Any help or instructions for this would be appreciated.