iPhone 4s asking for old Apple ID but nowhere to type code

My phone was disabled so I connected it with iTunes. We unlocked it and now it is requesting the old Apple ID. I don't know the old one but my brother made a password reset, and now it gave us a code but there is nowhere to type it in on the phone. The screen didn't reset for us to type in the code. What do I do? Of iPhone 4s

Solution 1:

You can type in that code immediately after your password in the password field.

What if I use two-factor authentication on a device running older software?

If you use two-factor authentication with devices running older OS versions, you might be asked to add your six-digit verification code to the end of your password when signing in. Get your verification code from a trusted device running iOS 9 and later or OS X El Capitan and later, or have it sent to your trusted phone number. Then type your password followed by the six-digit verification code directly into the password field.

Source: https://support.apple.com/en-us/HT204915