The 5498-SA details the contributions made to your HSA. Your payroll deferrals will appear on this form.
There's no reporting requirement for this form; it's for your records. However, if you made after-tax contributions (not thru your payroll at work), then you'll enter those into TurboTax manually: Federal Taxes > Deductions & Credits > Medical > 1099-SA, HSA, MSA and follow the prompts to the screens after the 1099-SA input page.
You'll notice on the page for Let's enter your HSA contributions, your payroll deferrals from your W-2 already appear.
If you took money out of the HSA, then you should have received a Form 1099-SA, which you would need to enter in TurboTax (same pathway as listed above, on 1099-SA page). Once you enter it, you'll be asked how much of the money was spent on medical expenses.
If you didn't take money out of the HSA and didn't receive a 1099-SA, there's nothing you have to do.
