https://www.groovypost.com/howto/bios-uefi-setup-guide-boot-from-cd-dvd-usb-drive-sd-card/
Have a look at the sections:
“How to Access Your BIOS or UEFI Setup Screen”
“How to Change the BIOS / UEFI Boot Order to Boot from a USB / CD Drive”
I found this article by searching based on the terms “how to change uefi on startup”
Kpon's Blog 