You would have to create a new account to have a different user ID.

Go to this TurboTax website to purchase one of the 2020 desktop CD/Download editions - https://turbotax.intuit.com/personal-taxes/cd-download/

you are not required to file online.

You can select the US Mail paper option with any TurboTax product.

@ cmck360697 wrote:
How do I change my account username?

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Are you referring to your Intuit Account ID?   You can change the User ID in the same account by going to the account settings.  Here's how:

• Log in to your Online account.  
• In the left menu column scroll down to select "Intuit Account."
• Select the tab "Sign In and Security."
• You will see a place to change the User ID for that account.