As I said before, the credit is not on the Provincial page.
When you are on the Claims for Dependants page in TurboTax Online, answer YES to the question. Then click the "Continue" button.
On the next page, click "Enter Credit Info" next to the dependant who you want to claim the credit for.
Then select "Children's sports and arts tax (provincial credit only)" and click the "Continue" button until you get to the "Did your child participate in sports, cultural, artistic or recreational activity?" page. There you can enter in your Sports and Arts amounts.
