Making correction to unfiled 2020 1040 SR

I was told on Feb 6 by MaryM428 that I did not need to amend my 2020 Federal Return since it had not yet been filed.  Mary instructed me to follow the directions in a link and I would be able to get my return back and make the changes before it is filed.  The link said I would receive an email today when return was available.  This has not yet happened.