That's an extra lock on the door, to keep your family's tree safe. The code is in your email – pop it in and you're through. Once you're in, your device is remembered for 30 days, so you won't be asked every time. You can also sign in with a passkey, if your phone or computer offers one.
Still stuck? Talk to a real person: send us a message, or email support@mywholefamilytree.com