Do so, then click on the Command Deck, and you'll suddenly be presented with a bevy of information. Your next task is rather delightful, as it asks you to open up a Treasure Chest, and really, who doesn't love doing that? After you've cracked it open, you'll be asked to press the Start button. Press the L and R shoulder buttons simultaneously to do it, then you'll be allowed to move on. If you're successful, you'll be prompted to lock onto a pendant. When you've found an offensive one you like (e.g., Strike Raid), face one of the pendants, and hit the Triangle button to fire it off. You can scroll through your equipped 'cards' with the Directional Pad. To pass the quartet of dangling rings, you'll need to use a Command Deck attack.
The first one comes easily-simply bash the X button (your standard melee attack) until you've completed a full combo-but the second may be befuddling.
For the most part, you'll be fine following their instructions, though you'll eventually be given a real objective: damaging the dangling pendants. They'll teach you how to move, leap, rotate your camera, and more.
Shortly after you begin, you'll be run through helpful tutorials. Once you're done with it, return to this segment. Its useful information will help you through the introduction and well into the adventure beyond.
If you haven't read the 'Starting Out' section yet, give it a gander. = Tutorial Terra Walkthrough Ventus Walkthrough Aqua Walkthrough Final