If I earned under $400 while driving for Uber, do I have to report this and where do I record this in TurboTax?

Did you receive a 1099 because you shouldn't have the magic number is $600 to have to file it on your taxes.

It depends, if you earned $400 or more and that was your only income, then you would still need to file a return to report the money you earned as an independent contractor for Uber. If it was less than $400, and you have no other income, then you would not need to file a return to report less than $400. 

If you have other income, you will still need to include the amount earned with Uber regardless of the amount you earned.  When you file a return you must include ALL income from ALL sources. 

To enter your self-employment income click the following:

• Federal
• Income and Expenses
• Show More next to Self-Employment
• Start or Revisit next to Self-Employment
• Yes, to you have any self-employment income or expenses
• Enter the type of self-employment work you do
• Click through a few more screens and you will get to a screen that says "Your XX info"
• Click Looks good
• Then you will come to a screen that says Let's enter the income for your business.  It will give you the option of 1099-NEC or Other self-employed income including the 1099K , cash and checks.  Select the one that applies to you and hit continue
• If you do not select one, it will not let you enter your income
• Enter your self-employment income on the next screen