Two-step verification code

If you see a password box, enter the password (ABC) followed by the code (123) or ABC123 (no spaces).

Hello,

If you have a trusted device running iOS 9 and later or OS X El Capitan and later, the verification code is displayed automatically on your trusted devices - iOS 6 isn't supported.

(https://support.apple.com/en-us/HT204974)

Best regards!