Level 20
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Get your taxes done using TurboTax

Go to My Info/Personal Info and click edit by your name.  Then go through the screens to the screen where you click on the state you live in.  You can change your mistake there and choose TX.

 

As for upgrading when you are using desktop Premier, look up to the top of your screen.  On the upper right there is a green arrow with the word "Upgrade" that you can click in order to upgrade to Home and Business.