If you upgrade to TurboTax Live, they will help you with your return and can also offer advice on completing a new W-4.
There is also help within the program that you can access to help you with your W-4.
Here's more info on that:
https://ttlc.intuit.com/replies/3301783
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"