If you have not Efiled yet, go back to the MY INFO section and EDIT yourself.
If you have already Efiled, the IRS may Reject your return. Then you can open it, correct your name and Efile again.
However, the IRS may Accept your return with your first name misspelled, as they are matching your SSN and Last Name with Social Security records.
Click this link for more info on First Name Misspelled.
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