Can't edit form.

I am using the desktop 2025 version of TurboTax.  I was not asked about 3rd party designee, so I went to the 1040 form to edit it directly.  The form can not be edited.  I can't do anything to the 1040 form directly or any other form for that matter.  Please tell me how to change the 3rd party designee.  

I have not filed yet.  I have progressed only to Smart Check.  

People have made previous posts, but they are old.