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#21
You just need to boot from the flash. If your BIOS is not set to see it first in the boot sequence, you'll need to go to UEFI Firmware Setting, and set the boot sequence to USB device first and your SSD/HDD second. Don't know the exact wording on your BIOS screen options, but you should be able to find it. Look for a tab that says something about "Boot" or "Boot Options" or "Boot Sequence".
Once set, it should boot from the flash. Remember to remove the flash before the next restart, or it will go in a loop booting from the flash. There's a countdown screen after the prep phase of 10 seconds, keep an eye on that. That's when you would pull the flash drive.
Might also be an option for "One time boot", like boot from USB Device.