If you haven't yet paid your TurboTax Online fee (or registered, if you're in a free version), you'll need to do so before you can print. We do this because you are paying us to help prepare your tax return, not the e-filing. You are able to pay for our product and then view the forms before you finish so you can make sure they are correct before sending them in(whether by mail or e-file). I'll put an article below on how to do that.
https://ttlc.intuit.com/replies/3338601