Two-Factor Authentication
I’m trying to turn off the two-factor authentication on my iPod so I can sign in on my computer, but there is no edit button to change it and it won’t let me turn it off. How can I fix this?
iPod, iOS 12
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See the following from Two-factor authentication for Apple ID - Apple Support
If you already use two-factor authentication, you can no longer turn it off. Certain features in the latest versions of iOS and macOS require this extra level of security, which is designed to protect your information. If you recently updated your account, you can unenroll for two weeks. Just open your enrollment confirmation email and click the link to return to your previous security settings. Keep in mind, this makes your account less secure and means that you can't use features that require higher security.
Also, it should not prevent you from signing in on a computer. If the computer is a Windows PC and you are trying to set up an app to sign in to iCloud email, you would use an app-specific password rather than your usual password. See: Using app-specific passwords - Apple Support
If it is a Mac computer running an OS earlier than El Capitan see the following from Two-factor authentication for Apple ID - Apple Support
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.