Please wait until you receive your refund before you make the change. The reason for this is that if the IRS makes any sort of adjustment before they give you the refund, you need to account for it in the amendment.
Once you have received your refund you can log back into TurboTax and log back into TurboTax.com or open your TurboTax software installed on your computer.
Select the option “Amend a return that was filed and accepted.” and return to the Personal Info section of the program to update your filing status. You can then print the return and mail it in for processing.
You can see more detailed instructions on the amendment process here: How to amend a return in TurboTax.
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