You need to log into your TurboTax account and proceed to work on your tax return. On the left menu column, you will see an option "My Info". When you click on that option, You will see a list of options, one of which is your filing status (Single, Married Filing Joint, Head of Household, etc...), click on the "Edit" option to the right of your filing status, and you can change it as is necessary.
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