Navigate to the BalenaEtcher website and download the appropriate version of BalenaEtcher for your operating system.

Insert your USB drive into your computer and launch BalenaEtcher. Select the Arch Linux ISO file you downloaded, then choose the USB drive as the target. Click 'Flash' to start the flashing process.

Ensure that you have selected the correct drive, as the process will erase all data on the drive.

Once the flashing process is complete, you can remove the USB drive.