Just started and turbo is already posting things wrong. How can I go back a page to correct it? Their help desk is closed, middle of the afternoon on a friday?

You can jump around and go back.  What do you need to change?  Just click on Federal on the left and then Income or Deductions and start the section over.

TurboTax support is open from 5am to 5pm Pacific time, Monday thru Friday

See this TurboTax support FAQ for contacting support - https://ttlc.intuit.com/turbotax-support/en-us/help-article/account-management/turbotax-phone-number/L0Od33nMQ_US_en_US?uid=lfgviwbm

Support can also be reached by messaging them on these pages https://www.facebook.com/turbotax/ and https://twitter.com/TeamTurboTax

I got a reply from a user saying help desk was open until 5.  My computer had already said "they are closed right now."  Those two statements can't both be true, but I got my taxes done.  The item I wanted to back up to and fix was part of my initial sign in information, which is not one of the items available to be clicked in the left hand column to go to.  But as I said, I got the taxes done.

What do you need to change?  By the way, you can't efile a return now.  Efiling is closed.  You have to print and mail your return.  You may need to move to the Desktop program to finish and file.