Read the instructions carefully before starting to play. Your aim is to raise a dragon so it can help you in the battle. To feed your dragon, you must toggle the arrows in the inventory and drag the food towards it. When it reaches a certain amount of HP, the dragon will evolve several amount of times.
Remember, you can wield 2 weapons at once, not just a sword and shield.
Use WASD to move, mouse to attack, I to open inventory,P to pause. Press Q to toggle quality in case of lag.