Using this product is super easy. First, open the Pokémon TCG booster pack that comes with each mini portfolio. You'll find 10 game cards, either a Basic Energy or a VSTAR marker, and a code card for Pokémon TCG Live. Start taking out the cards and place them in the mini portfolio. You can fit up to 60 cards in it. When it comes to the code card, you can use it on Pokémon TCG Live to get some in - game benefits. As for maintenance, keep the portfolio in a dry place away from direct sunlight to prevent the cards from fading. Also, be gentle when opening and closing the portfolio to avoid any damage to the cards. Don't bend or crease the cards while putting them in or taking them out. If you want to add more cards later, just keep buying booster packs and keep filling up your portfolio!