OK ... first of all stop going into this section ... you dealt with this back on the 2016 return so you do not have an active situation that requires the 5405 any longer.
Next try deleting the form ...
1.Open your return in TurboTax Online, if you're not already signed in.
2.Click My Account (top of screen)
3.Click Tools
4.Under Other helpful link….. click Delete a form
5.Click Delete next to the form you want to Delete
