I used to receive UCCB (until my third child turned 7). Now that the new UCCB covers children aged 6-17, do I need to apply for it all over again?

TurboTax says "You can apply online by using “Apply for child benefits” through the CRA’s My Account or complete Form RC66, Canada Child Benefits Application, and send it to your tax centre with any required documentation identified on the form. Click the CRA link below to find this form.", but there isn't a link below.