[HELP] How to add boot flags in this case

* Hardware: Acer Aspire 5742

* CPU: P6100

* GPU: not sure

* RAM: 4Gb

* What guide/tool followed: https://www.academia.edu/39050610/How_to_Install_Niresh_macOS_Sierra_on_PC

* What part I got an issue with: soon after booting from USB installer, getting a continuous message Still Waiting for Root Device

* What files/config I am using: Using Hackingtosh-Sierra-Zone.dmg restored to a USB per the instructions above

* Extra Info: guide says "in case of USB device detection failure, your OS X installation flash drive will not work and you’ll be left with a continuous message Still waiting for rootdevice, USBBusFix=Yes may fix it in chameleon"

My question is: to add this boot flag (USBBusFix=Yes), should I edit a file inside this USB installer I created? Is there a tutorial on how to edit these files? Which one? Which software should I use?

Sorry if this is very basic question, first attempt here.