TurboTax will only fill out line 4 on Form 1040 if you entered a Form 1099-R in the retirement section.
"You should receive a Form 1099-R showing the total amount of any distribution from your IRA before income tax or other deductions were withheld. This amount should be shown in box 1 of Form 1099-R. Unless otherwise noted in the line 4a and 4b instructions, an IRA includes a traditional IRA, Roth IRA, simplified employee pension (SEP) IRA, and a savings incentive match plan for employees (SIMPLE) IRA" (Form 1040 line 4 instructions)
Please see How do I amend my federal tax return for a prior year?
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