A passkey lets you sign in with Face ID, Touch ID, or Windows Hello — no password to type. You create it once, while signed in:

1. Sign in above with your password or an email link.
2. Open My Profile from the menu.
3. Find the Face ID & Passkeys card and tap Add a passkey on this device.
4. Confirm with Face ID / Touch ID when your device prompts you.

Next time, just tap Sign in with Face ID / passkey here. A passkey is tied to the device you make it on, so add one on each device you use.