If you just want to do the config.txt edit its sudo nano /boot/config.txt
add the dtoverlay=gpio-fan,gpiopin=18,temp=55000 then do a ctrl X, Y to save it.
You will have to reboot for it to take affect.
If you just want to do the config.txt edit its sudo nano /boot/config.txt
add the dtoverlay=gpio-fan,gpiopin=18,temp=55000 then do a ctrl X, Y to save it.
You will have to reboot for it to take affect.