How to use Jack Sparrow anki

Hello!

I have no clue how to use Anki on the mac book. I just downloaded it and I have no clue how to use the Jacksparrow anki deck. I downloaded it... now what? Everytime I try to open it, it says there's no application for it, but hwen I try to bring up Anki as an application it doens't show up on my computer :/