You can't e-file Form 3115 with your tax return, but you can't enter your information and print it in TurboTax Desktop.
With TurboTax open, go to Forms View using the Forms icon in the upper right. Select Open Forms in the left pane, type in 3115, and select Open Form. Select Form 3115, p1-3, then select Open Form.
You can also print the form and instructions using the link above.