I am not sure that I understand. Did anyone make any contributions to your HSA in 2018 (you, your employer, the mailman)? Did you take any distributions from your HSA in 2018? In either case, the IRS requires you to file form 8889, which you will do by going through the HSA interview.
But if you actually did not have an HSA in 2018 but were only looking to see the benefit of retroactively contributing to it, then you will need to delete all HSA from your return. The fastest way to do effectively this is:
1. make a copy of your W-2(s) (if you don't have the paper copies)
2. delete your W-2(s) (use the garbage can icon next to the W-2(s) on the Income screen
*** Desktop***
3. go to View (at the top), choose Forms, and select the desired form. Note the Delete Form button at the bottom of the screen.
*** Online ***
3. go to Tax Tools (on the left), and navigate to Tools->Delete a form
4. delete form(s) 1099-SA (if one), 8889-T, and 8889-S (if one)
5. go back and re-add your W-2(s), preferably adding them manually
6. continue with your return.
Note, however, if there is a code W in box 12 on your W-2, the 8889 will just come back, because someone did make contributions to your HSA in 2018.
