How do I apply for child tax credit

[DoninGA]

You do not apply for the credit.  You are either eligible for the credit or you are not eligible.
See this TurboTax support FAQ - <a rel="nofollow" target="_blank" href="https://ttlc.intuit.com/questions/1900923-what-is-the-child-tax-credit">https://ttlc.intuit.com/ques...>

[SweetieJean]

The program gives it to you automatically after you key everything in, provided that you qualify.

[Hal_Al]

The money you hear about people getting for just filing a tax return claiming kids requires them to  have some earned income (wages or self employment). Without earned income, they are not eligible for the "refundable" Earned Income Credit or Additional Child Tax Credit.  Both credits are calculated on the amount of earned income you have. No earned income means no "refund". A small amount of earned income means a small refund. The child tax credit does not "kick in" unless you have at least $2500 of earned income.