How to revise after clicking file

I needed to review my tax information as it looked on the regular IRS tax form so I clicked file now and selected file by mail. However, not all of my information is included yet. I need to go back and edit some stuff. 

 

I have not physically filed this return yet so it's not something I would amend. 

 

I've already paid the $170 so it's important that I be able to go back in and make the changes versus filing somewhere else. 

 

I've searched top to bottom and I cannot find any way to access my return.