If your computer will boot from USB, this will probably be the easiest route for installation. Assuming you have prepared everything from boot-dev-select-x86 boot-dev-select-arm64 and boot-usb-files, just plug your USB stick into some free USB connector and reboot the computer. The system should boot up, and unless you have used the flexible way to build the stick and not enabled it, you should be presented with a graphical boot menu (on hardware that supports it). Here you can select various installer options, or just hit &enterkey;.