After you file

You better go back and refer to the printout of your original return (you did print a copy, right) carefully RESTORE everything you changed so that you have your return back to EXACTLY what it was when you originally filed.

You CANNOT e-file a amended return.  The IRS requires that form 1040-X amended return be printed and mailed.

Perhaps some terminology/definitions would be in order:

AMEND:- your return is what you do AFTER your return has been filed and accepted by the IRS and/or state.  (No additional charge)

CHANGE:- your return is what you do BEFORE your return has been filed --simply go back to the respective information and change it as needed. 

CORRECT:- your return is what you do AFTER you attempted to file your return and it is rejected by either IRS, or state --again, simply go back to the respective information and change it as needed.

Above all  DO NOT DO ANYTHING until you find out if your return is rejected or accepted. 

NOTE:  When mailing a printed return it is always a good idea to go to the Post Office and mail it 'Certified' with 'Return Receipt'.  That way you will have proof that they received it and when it was received.