Where is the check box for when I'm the dependent?

It's in the My Info section. click on edit by your name and scroll down until you see the question. 

I don't see it at all, all I see is have dependents

You need to log back into your return and indicate in the My Info section of TurboTax that you are being claimed as a Dependent.  To do so, please follow these steps: 

1. From the left side of your screen, choose My Info
2. Click Edit under your name and then click continue until you get to the screen Let's Check for some other situations.
3. Check the box that Another taxpayer can claim me as a dependent on their tax return.  Then choose YES to the question Will this person claim you on their 2023 Tax Return.
4. Click Continue through the rest of the interview questions