Before you add Yubikey Authentication to your account, please ensure that the Yubikey authentication system is activated.
Once you have this activated (your App ID and API Key set), please follow these steps:
- Go to Users => your Profile page
- At the bottom of the page you'll see an area where you can input your Yubikey. Simply supply a Yubikey One-Time-Password in the text field and save.
Once these are set, the Yubikey functionality is ready to run as your valid 2FA option.