If you login and click My Tax Returns, then select the tax return that you have paid for already (assuming you started, finished and paid for one, then started a second one) and click Continue to view the completed tax return. On the viewing page you will see a green arrow pointing left that allows you to go back and change one of your answers. Click this button to go back, scroll down the page and change your answers as you see fit.
When you finish, your already paid-for tax return will update with the latest answers you just entered.
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