The correct answer is nothing. You do nothing with Form 5498-SA. Form 5498-SA is a statement of contributions. The amount shown on 5498-SA should have already been on your W2 so there's no need to enter it on your Federal tax return. Form 5498-SA is for informational information only.
The Form is confusing because it looks just like a 1099-MISC. But not to worry. No need to enter onto the tax return.