You can't, unless your tax return is rejected. If it is rejected you can make changes to your return. Once it has been transmitted, not changes can be made unless it is rejected. You will have to file an amended return to make any changes. You should wait until your return has been accepted and you have received your refund (if you are expecting one) before you amend your return. For information on how to file an amended return see the following: How to File an Amended Tax Return with the IRS
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