How to use your usb:

Turn on your chromebook.

Press the power key (⏻), reload key (↻), and ESC key at the same time.

Your screen might look like this or something else:

Now press CTRL + D.

Your screen might look like this or something else:

Now hit the enter key.

Your screen might look like this or something else:

Press the power key (⏻), reload key (↻), and ESC key at the same time again.

Your screen might look like this or something else:

Now insert your usb:

You've done it! Your screen will be on the sh1mmer menu:

Well thats it for the guide.

What now?

Do what you want in the menu!