How do I prepare another return once mine is done

[WilsonTR]

If you are using TurboTax Online you can only prepare and file one return per account. If you need to prepare another return, another account will need to be used/created. You can create up to 5 accounts with the same email address. The TurboTax product will need to be purchased under each account.

If you are using TurboTax Desktop you can prepare and e-file up to 5 federal returns and you can prepare 1 state return (there is an additional fee to e-file the state return). There is only one fee per download/CD.

https://ttlc.intuit.com/replies/3288574