When your Chromebook reboots, you'll get yet another warning screen: "OS verification is off." Press Ctrl+D one more time to get past this warning.

When you land inside Chrome OS, it will be as if you're setting it up for the first time. You might have to click a "Let's go" button to get to the screen where you can choose a Wi-Fi network. Select your Wi-Fi, but don't continue on!

Once you've selected a Wi-Fi network and successfully connected, hold the Ctrl and Alt keys and press the -> button (the second button from the esc key). You should see a stark-looking terminal screen and text prompt.

At the stark-looking prompt with a "localhost login," enter "chronos" as your login. That should change the prompt to "chronos@localhost," give you the permissions you need to run the next step.

If you're having trouble logging in at the localhost prompt, you can get back to the ChromeOS setup (Ctrl and Alt and <- button). Once you're inside ChromeOS, hold Ctrl and Alt and hit 'T', then type "shell" at the command prompt. This also makes it easier to copy/paste the command in the next step.