If you're an employee you should enter your expenses under Deductions & Credits >>> Job Expenses. If you're self-employed or receive income on a 1099-misc box 7, then you should enter your expenses under Self-employed income & expenses, which you'll find under Federal Taxes >>> Wages & Income >>> Self-employment. **If you don't have the Federal Taxes tab, then you'll find this under the Business tab.
You can preview your form 1040 at any time by following the steps below. https://ttlc.intuit.com/replies/3302322
You can view all of the forms, including schedule A itemized deductions (where job expenses will show) and schedule C (where self-employed income and expenses are reported), after you pay for the software in Step #1 under the File tab. Then, you'll print all of your forms, before filing, by following the below steps: https://ttlc.intuit.com/replies/3338601
No charge to call support if you're using a paid edition of the software (Ie. not federal free). Allow plenty of time, this time of year for your call. Please click here to contact TurboTax Support for additional assistance. Enter a question, like "privacy", then you will enter your info and be provided with a phone number to call.