In the self-employment tax section I can't find where to deduct half of my tax

You do not need to enter this. TurboTax will automatically do this for you. 

But it's not. It's deducting my expenses from the income, but nowhere do I see that they have deducted half the employment tax. 

The one-half of your self-employment tax is deducted on Form 1040 Schedule 1 line 15.  

 

To preview your Form 1040 using TurboTax Online, use the following steps while working in your tax return:

 

• In the navigation area on the left side of your screen, click Tax Tools to expand your choices
• Click Tools, which will open the Tool Center
• Click View Tax Summary under “Other Helpful Links…”
• Click  Preview My 1040 on the left side of your screen to see your actual tax form

 

You will be able to also see Schedule 1 as part of the preview.

 

If you are using one of the desktop versions of TurboTax, click the Forms button in the upper right corner of the screen to go to Forms Mode where you can view Form 1040 or any other form that is included as part of your return.  Once you are in Forms Mode, click the form name in the list on the left side of the screen.

 

@Heather-alyssa-harman 

"Preview My 1040" is not one of the options in the Helpful Links section...

 

Found it somewhere else, though. 

Great, can you view Schedule SE for the deduction (for half the SE tax) on line 13?

That amount also flows to Schedule 1 line 15 and finally (after everything is added on Schedule 1) flows to Form 1040 and is part of the entry for line 8.