Did you already make a payment? If not, this will be simple.
If you'd like to change the version of TurboTax you're using:
-Go to the right-hand side of the screen and click My Account.
-The drop down menu will give you the option to Clear & Start Over.
(If you decide to choose this, all data will be erased. The next time you sign into TurboTax you will have the option to choose a different version.)