In the bios, you should see several sections across the top.. Along the lines of info, system, boot, security, configuration, exit
We use the arrow keys to navigate the bios, the mouse wont work. And if you look around the edges of the screen it will tell you what keys change values.
What we are looking for, is most likely in the boot section or security section
We want to disable secure boot if you see it
We want to disable fast boot if you see it
We also, want to adjust the boot order so that the usb drive is set to the first priority.
Once we make these changes, we want to save the settings and exit.
If youd prefer, we can move this to phone support to cut down on the back and forth time of navigating the settings and making changes.. Other wise, let me know which options your able to find and change, specifically, as you change them.