First of all did you use the media creation tool here from MS to create the bootable USB drive? Then when you boot start tapping F12 which will pull up the boot menu. From there you can select the USB drive.
Pls help. How to boot from usb? I am using Dell Optiplex 3070 SFF. I have create windows bootable installer in USB drive. But not detected when i boot my pc.
How to boot from usb. Dell Optiplex 3070 SFF