How do I redeem my scratch tickets?

I have followed multiple guides and it doesn't let me redeem my tickets. It is telling me I have to pay for Ark Cash.

How do I redeem these for free?

Assuming you have the tickets in you inventory, if you click on the name of the Scratch itself in the Scratch Menu (for example, the new one, Crimson Dawn) a small context menu will pop up that will give you a few options, including to use your tickets.