Help?

Okay, so I'm probably being really thick here. I got a copy of Sims 3 World Adventures today, and it's got a red tag in the middle of the side, where you'd normally put your thumbs to open it, and I can't work out how to get past it. Has anyone had a case like this and can you tell me how to get into it?

How will I cope with the game if getting into the box is this hard?

ETA: Not me being too dumb to live, they should have taken it off in the shop. Grrrr