Enter the Fate and Fortune Cards section within the Zombies menu, where you can edit and customize your Deck pack to include different types of Cards.
You must fill the meter by earning points either spending cash or killing Zombies before you can use a Card. Each Card will allow you to do different things when you activate that particular Card.
You only have five different Fate Cards available at Level 1, with more Fate Cards unlocking as you level up. Fortune Cards are similar to Fate cards, but are only unlocked through Zombie Crates. Fortune Cards can only be used once per Card unlock. Once you have gone through your entire Fate and Fortune Card Deck, you can refill your Deck by visiting a Fortune Teller and paying the required price.