Can I file by mail a previous year's return that was already completed and available in My Docs?

I had trouble submitting last year's tax return online so I need to do it by mail.  The return is already completed and paid for and a copy is available on My Docs.


Can I just print the file in My Docs and mail this to the IRS or do I need a different form?? 


The only answers that I can find refers to preparing a return from scratch using the desktop software.  Would I need to purchase this seeing as that I have return already prepared and paid?