Craig Jameson

Hi folks, I have an old S905X Box that I want to install Armbian on but am completely lost - I tried following this page https://forum.armbian.com/topic/12162-single-armbian-image-for-rk-aml-aw-aarch64-armv8/ But it talks of things like editing uEnv.txt but I cant find that file. Can somebody talk me through, step by step how to install Armbian on an S905x box? I can boot from SDCard as I have one formatted with Coreelec but Android is still on the internal hardware.