I'm unable to choose my one and only dependent in the Dependent Care Credit section. Any suggestions for the fix here?

Have you entered the income you earned from working yet?   If you start working on the childcare credit before you enter a W-2 or 1099NEC  --  or some other self-employment income that does not show a loss --  for income earned from working, you will not see the credit.

Oh that may be the issue then! I was filling out all the information that I could prior to receiving my W-2 from my employer, so it's highly likely that since I haven't received that yet and entered in that information, my dependent isn't going to show up. I'll see if I am still experiencing this issue after I've had a chance to input my W-2 info. Thanks so much!