The Box 4 on my W-2 shows Federal tax withheld but this form is saying Box 2 Federal income tax withheld. What box do I put Federal income tax withheld?

The form you have in hand is apparently not a W-2 but is instead probably some type of Form 1099.  Enter the form in the correct section of TurboTax for the type of Form 1099 that you received.

Did someone give you a made-up W-2?

Box 1 is Wages for income tax purposes

Box 2 is withholding for federal income tax

Box 3 is Wages for Social Security purposes

Box 4 is tax withheld by your employer for Social Security

Box 5 is Wages for Medicare purposes

Box 6 is Medicare tax withheld by your employer

Does your W-2 really not match this?  In any case, the amounts that you enter must correspond to the list above, no matter how they are on your W-2.