You are correct GA does not tax Social Security or Railroad Retirement benefits. You will only need to verify the social security benefits that were taxable on your federal return.
The box in the GA state interview should populate automatically with the taxable amount from line 6b on your federal form 1040.
If you put your cursor in the box and backspace to delete the entries that you may have accidentally made and then "Continue" at the bottom of the page the box will populate correctly.
If none of your social security was taxable, then the box will be blank.
If you wish, you can check line 6b on your form 1040 in TurboTax online versions using these steps.
1. Select "Tax Tools" in the left hand menu
2. Select "Tools"
3. Select "View Tax Summary"
4. Select "Preview My 1040" in the left hand menu
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