Can I erase what I have done on my taxes and start over I didn't sign yet I left some things out

[user4054004581]

I want to file jointly but with a form 8379

[DoninGA]

If you are using the online editions, have not filed your tax return, have not paid for the edition you are using, have not registered the Free online edition, then you can clear your tax return and start over.  Click on My Account at the top of the online program screen while working on the 2016 online tax return.  Click on Clear & Start Over.