What did they tell you when you ordered them online? Perhaps you can pick them up at the box office in the venue, or maybe you have to go to any music store (once you're in Barcelona) that is affiliated with ticktackticket and there they print them for you.I remember when we, spanish fans, bought them at the record stores, there were no actual tickets, they used the computer to buy them through ticktackticket and then the computer printed them for us.