Yes, you can complete/edit form entries using Forms Mode in TurboTax for Desktop and still e-file your return. Be sure you have no forms with red exclamation marks, which mean there are errors on the forms. Don't override any calculated numbers (in a black font), as this invalidates the return for e-filing.
In most cases, running SmartCheck from the step-by-step interview (under Review) will help you locate any e-filing issues.