1. Log in to your Gmail account. Click the Google Apps grid (square icon) in the upper right corner, then select Account.
2. In your Account settings, navigate to Security > 2-Step Verification > and click Get Started.
3. Enter your password and click Next. On the following page, skip the phone setup and select Choose another option. From the dropdown, select Security Key and click Next.
4. Ensure you have your Yubikey with you, then click Next.
5. Insert your Yubikey into the USB port of your computer and tap the gold disk on the key. (Wait briefly if your laptop takes time to recognize the device.) A security pop-up will appear; click Allow and then Next.
6. After successful registration, name the Security Key by entering the asset tag from your key, then click Done.
7. To log in using your Yubikey, enter your username and password, click Next, and tap the button or gold contact on your Yubikey.