By default, the app will create a card for you when you sign up.  But, you can change this info or add another card in v3. Off the My Cards screen, click the BlackBerry menu and either Add Information or Add Photo.  Follow directions on these screens to create all fields and photos you'd like to add to your cards.

Then, click Add New Card off the BlackBerry menu, create a Card Name, and hit Save. Now, on the main screen, check off the photo and fields you want on this new card and hit Save off the BlackBerry menu.