Something is unclear here. Did you end up filing a 2023 return last year or not? If your 2023 return was not ever filed, then stay away from anything that says "amend." You do not amend a return that was not filed. Amending is only done for a return that was filed and fully processed ---but that has missing information or a mistake to correct.
If your 2023 return was not filed last year, you can file it by mail now. E-filing is closed for 2023. Print it, sign and date it in ink, and mail it in. If it is a joint return, both spouses must sign.
Only a 2024 return can be e-filed. If you have six digit IP PINs for 2024:
If you have a 6 digit PIN issued to you by the IRS you need to enter it in order to e-file. Go to Federal>Other Tax Situations>Other Return Info>Identity Protection PIN and enter the six-digit PIN.