If you have multiple tax returns to file then you should be using the TurboTax desktop editions. With the desktop editions you can create, complete and file as many tax returns as needed at no charge after purchasing the software - https://turbotax.intuit.com/personal-taxes/cd-download/
With the desktop editions you get 5 free federal return e-files. After the 5 e-files have been used, further tax returns can only be printed and mailed.
With the online editions you can only complete and file one tax return per account and User ID. To create and complete another tax return using the online editions you will need to create a new account with a new User ID - https://turbotax.intuit.com/personal-taxes/online/
