How do I enter an NOL it on my tax return?

You have to enter the NOL into the program (of course, you have to calculate it first).

You should see Net Operating Loss/QBI Carryforward Loss in the program.

You can enter your NOLs in TurboTax Online by following these steps:

1. Within your Federal return, click on Income & Expenses at the top of the screen
2. Scroll down to Other Business Situations and click Show more
3. Choose Start on the line for Net Operating Loss/QBI Carryforward Loss and progress through the interview.

When I click on "Business Income and Expenses" I get "How do you want to enter your business income" , there is no "other business situations" to scroll down to.  What am I doing wrong?

I found out that if you have a NOL from rentals (Schedule E), the NOL is entered as an "other miscellaneous expense" in the Expense Review for the rental.

I am married filing jointly. The NOL carryforward is just for my wife's income. How can I do that?

Thank you!

You can't.  If you file jointly then everything on the tax return is joint - including an NOL carryforward.  

In order to separate the NOL you would have to file married filing separately.

@George B4