Iphone 4s
For some reason I am typing all of my Apple information right but then I have to put in a verification code, but there is no where on the iphone 4s to put it in. I am very confused.
iPhone 4S
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It sounds as you are asking how to use Two Factor Authentication on a device that doesn't meet minimum system requirements.
See Two-factor authentication for Apple ID - Apple Support
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—like an Apple TV (2nd or 3rd generation)—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.