Please read the Sprintax page carefully - it does not say that you need to mail a copy of your federal tax return anywhere. Instead, it tells you how to view and save a copy of your federal return.
It does, however, tell you to mail your state tax return.
If the change is on your federal return, you will need to amend your return. To do this, you will need to wait until the IRS has finished processing your return (generally 3 weeks or when you get your refund). You should go back to Sprintax and ask about the amendment process.
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