After you file

Ok, where do I set this 5 digit PIN on the paper 1040?

 

The only option I see is under "Third Party Designee", am I missing something?

 

Also, since it's a minor, shouldn't I be filling the Third Party Designee with my Name, number? The PIN that goes into the Third Party Designee, that would only be if the IRS contacts me for questions - that's won't be used for the minor's 2024 tax returns when it asks for the 2023 PIN, right?