Yes you can mail the forms. You don't need to mail any worksheets or backup info. If you need to change anything you need to download the .tax2021 data file and install the 2021 program to open it.
If you paid for Turbo Tax 2021 online you can ask for the download Desktop program. You need a full Windows or Mac computer to install it. Post back if you need help on opening the .tax2021 file in the program.
How to contact Turbo Tax
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-contact-turbotax/00/26991
What is the Turbo Tax phone number
https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632
