Just like any other computer!
If you don’t have a coverkeyboard, youre going to need usb c otg adapter or a usb hub if you want to boot from usb diskdrive.
Attach the cover keyboard and the usb disk drive. Press the power button and keep tapping the escape(esc) key while the cube logo is on the screen. When you see the windows waiting circle animation you’re to late.
If you don’t have a coverkeyboard attach the usb c otg adapter or a usb hub. Connect them both to the tablet. And press escape when device is booted on.