Hi Jean! You're going to look in a few places in your game, to find all the pieces & features of "Lock Puzzles" add-on. Under the Journals tab, find Lock Puzzles folder, inside there find Lock Puzzles Instruction Manual (read that, it explains how to use it). There you also find the Lock Puzzles Solutions handout (only visible to the GM of course). Also look under Collections tab, under Card Decks, and click "Show" on the Lock Puzzles deck. Finally, look under Pages toolbar, there are several Pages set up for Lock Puzzles, such as Steel Door, Wooden Door, and locked Chest. With all those components + the instruction manual text, you'll see how it works, but if you have more questions feel free to follow up and post here. Others from the community, or even the artist of the product, may come along with their experiences and tips.