When you level up at each 5 level incriment (level 5,10,15,20, and so on) you should go to your home page. Simply click the UR logo at the top left or the house symbol next to the play button. Then next to where it shows how many friends are playing or your little type in quote thing, it should give you an option to get your leader cards. Click that and then on the next page you can click each leader card for each 5 level incriment you've attained. Easy as that.