Resolve Windows 10 related issues for your HP computers or printers by HP Windows 10 Support Center
Are you asking how to get to the Boot Options Menu to choose a USB drive to install from?
If so, hold the Volume Down (-) button and Power button together for several seconds until the Options screen appears.
You will want to connect your USB drive and a USB keyboard/mouse using a something like a 4 port USB hub and an OTG USB adapter.
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