Phone support is not provided with the Free Edition. If you are using a paid version of the software or if you purchased PLUS you can get phone support when customer support is there. Otherwise, post your question here and someone will try to help.
To call TurboTax customer support
https://ttlc.intuit.com/questions/1899263-what-is-the-turbotax-phone-number
Customer support is available from 5 a.m. to 9 p.m. Pacific time
Why do I have to pay for Turbo Tax Premium service when filing a e file tax return for refund to my checking account?
@tchatas You do not "have" to use Premium Services. Pay your TurboTax fees upfront using a credit or debit card BEFORE you e-file and you will not be using Premium Services. When you say that you want to pay for using TurboTax by paying from your federal refund, it puts an extra $45 fee for that ---a third party bank receives your refund, takes out the amount you owe to TT, collects its own $45 fee, and sends you the rest. You are NOT required to do that.
How can I see my TurboTax fees?
https://ttlc.intuit.com/questions/2565973-how-do-i-review-my-fees-in-turbotax-online
If your TurboTax fees are higher than expected, you can reduce them by removing add-ons (BEFORE you e-file) :
Remove Premium Services