The AnKing deck only has an “instructions” subdeck; the rest of the cards are organized by tags. You can learn more about the deck’s structure here: AnKing Step Deck Wiki
Your cards are probably suspended. Please follow this tutorial to choose the tag you want to study and unsuspend the cards within it: How to Get Started Studying
If the instruction card still appears when you start studying the deck, just move past it, and you’ll begin to see the cards you unsuspended.
Let me know if you need help with anything else. 