That's asked in the retirement contribution section, since the answer has an impact on the deductibility of Traditional IRA contributions.
You can get there by following this pathway: Federal Taxes > Deductions & Credits > Retirement & Investments > Traditional and Roth IRA Contributions.
Follow the prompts, entering your contribution amount and responding to the various questions. Then you'll come to the screen that says Retirement Plan Coverage? and you can give your answer.
