My itemized deductions are larger than my standard deductions but turbotax is using the standard on my tax form. How do I reach an expert to resolve this?

If you are just adding up the amounts for the itemized deductions without considering the caps, limits,  and floors involved, you are not using the right amounts so your idea that the itemized deductions are more may be incorrect.

Many taxpayers are surprised this year because their itemized deductions are not having the same effect as they did on past tax returns.  The new higher standard deduction and the elimination of certain deductions, as well as the cap on state and local taxes have had a major impact.

Your itemized deductions have to be more than your standard deduction before you will see a change in your tax owed or tax refund.  The deductions you enter do not necessarily count “dollar for dollar;” many of them are subject to meeting  tough thresholds—medical expenses, for example, must meet a threshold that is pretty hard to reach.  The software program uses all the IRS rules that apply to the expenses you enter, and it tells you if you have enough to use your itemized deductions or if using the standard deduction is more advantageous for you.  Under the new tax laws, some deductions have been capped—there is a $10,000 limit to the itemized deductions for state, local, property and sales taxes.

Your standard deduction lowers your taxable income.  It is not a refund 

2018 Standard Deductions:

Single   $12,000  (+ $1600 65 or older)

Married Filing Separately    $12,000  (+ $1300 65 or older)

Married Filing Jointly  $24,000  (+ $1300 each spouse 65 or older)

Head of Household  $18,000  (+ $1600 65 or older)

Look at line 8 of your Form 1040 to see your standard or itemized deductions.

https://ttlc.intuit.com/questions/4482873-which-federal-tax-deductions-have-been-suspended-by-tax-reform

But if you want an "expert" review:

https://ttlc.intuit.com/questions/4124827-how-do-i-connect-with-a-tax-expert-in-turbotax-live

ONLINE
 If it's giving you the Standard Deduction and  not showing you Schedule A you can check the actual amount of itemized deductions by using by going to
Tax Tools on left
Tools - Topic Search (top left box)
Type in  itemized deductions, choosing.  It should highlight that in the list, click on GO

Then Click on "Change my deduction". That will display the actual amount of itemized deductions vs. the standard deduction.    (Be sure to uncheck "Change my deduction" after checking it so you do not lock in the wrong deduction.

How to change between the Standard Deduction and Itemized Deductions
https://ttlc.intuit.com/questions/1900142-how-do-i-change-from-the-standard-deduction-to-itemized-or-vice-versa

This year deductions are changing and several will be limited.  There is a max 10,000 limit of State, local, property, and sales tax (SALT) deduction.  And employee job expenses have been suspended.  You can only deduct Medical/Dental that's over 7.5% of your AGI.

FAQ on 2018 changes https://ttlc.intuit.com/questions/4482394-how-will-tax-reform-affect-my-2018-federal-tax-return

Deductions that have been suspended for 2018
https://ttlc.intuit.com/questions/4482873-which-federal-tax-deductions-have-been-suspended-by-tax-reform