1040-X Dependent Status

I have a follow-up question to one I previously asked.

 

"I filed my 2020 taxes via a free online service, and accidentally said that I could not be claimed as a dependent. Now my father is unable to claim me on his taxes, or file as head of house hold."

 

I was told in order to fix this, I would need to amend my taxes with form 1040-X. I am unable to complete this via an online service, so I am printing a physical copy.

 

However, I do not see anywhere to change my dependent status on this form. Do I just explain it in Part III (Explanation of Changes)? I appreciate any help.