If you have not e-filed your return and it has not been accepted by the IRS, then under no circumstances do you click the AMEND button. There are no exceptions.
You only amend a return *AFTER* you have e-filed it and the IRS has accepted it. Even then, you still do not amend until after your e-filed and accepted return has been processed completely, and you have physical possession of any refund you may be expecting on that originally e-filed and accepted return.
Since you have not e-filed, just navigate through the program and make whatever changes you need to make.