It looks like you are posting your question from online TurboTax. You cannot use online for a 2021 tax return.
What code are you talking about? The license code to use the 2021 CD/download? Did you purchase the 2021 desktop software?
Access your downloads here
https://shop.turbotax.intuit.com/commerce/account/secure/login.jsp?pagecontext=download
https://ttlc.intuit.com/community/tax-topics/help/activating-turbotax-cd-download-software/00/852971
You cannot change the tax year. The current online program is for 2023 only. Only a 2023 return can be prepared online and only a 2023 return can be e-filed.
Online preparation and e-filing for 2020, 2021, and 2022 is permanently closed.
Note: The desktop software you need to prepare the prior year return must be installed/downloaded to a full PC or Mac. It cannot be used on a mobile device.
To file a return for a prior tax year
If you need to prepare a return for 2020, 2021, or 2022 you can purchase and download desktop software to do it, then print, sign, and mail the return(s)
https://turbotax.intuit.com/personal-taxes/past-years-products/
You may also want to explore purchasing the software from various retailers such as Amazon, Costco, Best Buy, Walmart, Sam’s, etc.
Remember to prepare your state return as well—if you live in a state that has a state income tax.
When you mail a tax return, you need to attach any documents showing tax withheld, such as your W-2’s or any 1099’s. Use a mailing service that will track it, such as UPS or certified mail so you will know the IRS/state received the return.
Federal and state returns must be in separate envelopes and they are mailed to different addresses. Read the mailing instructions that print with your tax return carefully so you mail them to the right addresses.