If you haven't yet filed, please see the following TurboTax FAQ, "How do I print a copy of my TurboTax Online return before filing?":
https://ttlc.intuit.com/replies/3338601
To print your return after filing, please see the following TurboTax FAQ, "How do I print a copy of my TurboTax Online return after filing, for my own records?":
https://ttlc.intuit.com/replies/4193463