Using 2-Step Verification to Sign In
When you log into a website or service protected by The Key, you'll see a prompt similar to the one below.
If you have already Setup 2-Step Verification for The Key, open the Google Authenticator app on your mobile device (or use Authy Desktop).
Type the generated 6-digit code into the blank provided, and click Continue.
Check the "Don't ask for codes again on this device" box to have this device remembered for 30 days.