Open Security in Profile & Settings to add an optional second step from an authenticator app to your Calder account.
Choose Enable authenticator app, scan the QR code with Google Authenticator, Microsoft Authenticator, 1Password, or another TOTP app, or type in the manual key instead. Then enter the 6-digit code from the app and choose Verify and enable.
The page shows your status as either Not enabled yet or Enabled on this account, and each verified app is listed as verified and active. Choose Disable and confirm to turn it off again.
While it is on, Calder may ask for the 6-digit authenticator code during sensitive steps such as resetting your password. If a code will not verify, check your authenticator app and try again.