Can you claim Volunteer firefighter hours from previous years?

I am a volunteer firefighter and I didnt know about this tax credit

Getting started

Yes, you can add it to your previous returns. You can use ReFile in TurboTax or you can use the Canada Revenue Agency (CRA)’s My Account service to make the changes. This TurboTax FAQ has more information on changing a filed return: I've filed my tax return. Can I still make changes?