if i no longer remember my 5 digit self select pin how do i get this changed?

To file your tax return, you will need EITHER last year's self-created 5-digit PIN, or last year's AGI (adjusted gross income). Your 5-digit PIN isn't saved anywhere; in this case you can use you AGI instead. 

Your 2023 AGI is located within your prior-year tax documents Form 1040, Line 11.

How do I find last year's AGI?