See also our video:
Download balenaEtcher: www.balena.io/etcher/
Insert USB-stick and open balenaEtcher
Select downloaded *.iso by clicking on ‘Flash from file’ (the screen might look different based on your operating system)
Select the USB-stick by clicking on ‘Select target’
It will flash the image on the USB-stick
You are done!
These steps are also available as a YouTube tutorial from the user kilObit.