This TurboTax Canada FAQ tells you how you can claim the Manitoba fitness tax credit: How do I claim the Manitoba fitness tax credit?
Thank you, @TurboTaxSusan, but the MB Fitness Tax credit is a different category. I mean the Children's Arts and Cultural Activity Credit. The description is available here: https://www.gov.mb.ca/finance/personal/pcredits.html#cultural
It used to be easily accessed before, but in the new TurboTax interface (which, by the way, is way more confusing than the old one) I can't find it anywhere, even when I search using the search box.
I apologize for mixing up the credits, but they you would claim both the same way (if you are claiming for a child's activity).
In TurboTax Online, from the Tax home screen, click on Deductions, then Claims for Dependants. You can check off whatever you need here.
Thanks for sharing the screenshot @TurboTaxSusan! I was looking at the wrong spot, under Provincial Tax Credits (MB), but now I found it.
Appreciate the help!