In the File section of the program on Step 3 you will need to change the method of filing to Print to Mail from e-file
You will have to pay the TurboTax account fees, if any, before you can print the complete tax return for mailing.
Click on Tax Tools on the left side of the online program screen. Then click on Print Center. Then click on Print, save or preview this year's return. Choose the option Include government and TurboTax worksheets