How can I change in turbotax the child tax credit as my daugher applies to that, but the program doesn't allow me to do so?

How old is she?  Was she born in 2023?  Or had to be UNDER 17 on Dec 31, 2023.  Try deleting them under My Info and then add them again.  That usually fixes it.

There are a couple questions you could have answered wrong under My Info.  Click on My Info then click Edit by Dependents, then click Edit by their name and go though all the screens again.

First of all check their date of birth.  Also you need to enter a ssn for them.

If your child was away at college, count the number of months away as having lived with you.  The correct answer to claim the person is to say "the whole year". This will indicate you supported the person the whole year, thus it will be entered on your return correctly showing up as a dependent.   Or if your child was born during the year they are considered to have lived with you the whole year so be sure to answer All Year (pick the top box for the Whole Year).

Or the one that says did your CHILD pay more than half of their support.  It's not asking if you did.