I need to edit my taxes

If you haven't filed your taxes you can simply log back in and click Continue Where You Left Off

If you have filled 

Wait for the original return to be completely processed.

Here are steps to amend a current tax return.

TurboTax Online

1. On the Tax Home screen, scroll down to Your tax returns & documents and select the year you want to amend.
2. Select the Amend (change) return dropdown, 
3. Then Amend using TurboTax Online. 
4. If you're told to amend your return via TurboTax Desktop, follow the steps for TurboTax Desktop instead.
5. Continue through the screens,
6. Make the changes you need to make, and carefully answer the remaining questions to finish amending your return.