Sorry I don’t understand. You have to print and mail your tax return to the IRS. What prefilled form do you have? You can’t attach a pdf to your return. And it is too late to efile your return.
You have missed the October 15 deadline to e-file. Your tax return can only be filed by mail now. And we do not know what you mean by "pre-filled" forms. If you have not finished preparing your 2023 return now, you can only use the CD/download software now---it is too late to use online software to start a 2023 return.
You need a full PC or Mac now---you cannot use a phone or a mobile device with the desktop software.
CD/DOWNLOAD (This requires a full PC or Mac—-cannot be used on a mobile device)
https://turbotax.intuit.com/personal-taxes/cd-download/
You can also purchase the CD/download from various retailers such as Costco, Amazon, Walmart, Best Buy, Staples, Sam’s Club, etc. etc. etc.
This link Where can I obtain authentic TurboTax software? has a list of authorized TurboTax resellers.