In this step, you will be asked if you want to add extra security to your previously selected drive.
Select the drive where you want to install the elementary OS and click Erase and Install. If you want to clean install elementary OS, I recommend choosing the “ Erase Disk and Install” option.
You can download it from balena.io/etcher.
Etcher is a small software used to flash a USB drive from any operating system such as Windows, Linux, macOS.