When the IRS rejects your tax file...sometime/any day next week...
You will be able to look for it enter your 6-digit "IP PIN" on the Other Tax Situations page in the Federal section.
Then re-e-file.
(If you e-filed a State with your Federal, that won't go in if the Fed is rejected, so that will need to be re-efiled the second time around)
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*