Instructions
Go to http://www.yugioh-online.net and select your native country.
Click on Game Download to download the software. Once you are done downloading, double-click the Yu-Gi-Oh! icon shortcut that appears on your screen. This will launch the game.
Select Blister's Hideout from the main screen and then select BoosterPass. Choose from the available themed-passes such as Perfect Judgment or Dark Necromancer to purchase cards. Each Booster Pass costs $2.99 USD.
Go back to the main menu and select Edit Deck.
Select Main Deck and then Official to access the cards you purchased from Blister's Hideout. You can add or remove cards to your deck by dragging them from the trunk to your deck.
Add enough cards from your trunk so that your deck has between 40 and 60 cards, in accordance with official Yu-Gi-Oh! rules.
Click on Save to make the edits to your deck final. You will now be able to challenge other duelists from the main menu with a newly made deck.