On the home screen tap on on the "+" symbol in the top right corner. Then tap on the "magnifying-glass" in the top right corner to enter the name of the card you want to create. Then tap on the card to select it and add it. The barcode scanner will either open automatically or you will have to scroll down and tap on "open scanner". After you have scanned the barcode you can save the card by tapping the "check-mark" in the top right corner. If a card is not available as a template you can add it under "other card".