I'm using Turbo Tax Deluxe and cannot enter my business vehicle expense. When I click the review button, I get a spinning circle cursor

You may need to clear your cache and cookies. Make sure your return is saved in your TurboTax account and then sign out. Clear the cache and delete the cookies on your computer, open a new browser, sign back into your account and try entering your information again. You may also want to change browsers, for example, if you are using Chrome, try switching to Firefox.