After you file


@Jackierrose wrote:

Why can’t I cancel it??


You haven't said anything about your situation.   Have you already efiled a return; i.e, transmitted it to the IRS?

 

  If you actually efiled, then you'll need to wait until you hear back from the IRS if the return was accepted or rejected before you will know what steps you can take.  We can tell you more when we know what you've done.