The safest - although brute force - way to delete anything to do with your HSA is to do the following in this order:
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.
Please follow the instructions listed here for deleting unwanted forms from your tax return: https://ttlc.intuit.com/replies/3288508