You cannot correct the amount on the first line on that screen ("Let's enter your HSA contributions").
Instead, you must return to the W-2 and correct it there.
It's difficult for us to say, since we cannot see your tax return, but evidently TurboTax has your code W amount twice in memory.
I suggest you clear the W-2 and HSA information and start over.
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)... Note, if you notice that there is still a W-2 form lingering, please delete it also.
5. go
back and re-add your W-2(s), preferably adding them manually
6. go
back and redo the entire HSA interview.
